Dragonite
Elo Bandit's Stash of Dragonite Counters
Calculator Importable: https://pokepast.es/205d5e5d189587db
Guaranteed to beat Physical & Special Dragonium, Flyinium, Firium, Choice Band, and Choice Scarf Dragonite.

Outrage

Charizard-Mega-X @ Charizardite X  
Ability: Blaze  
EVs: 248 HP / 20 Atk / 144 SpD / 96 Spe  
Careful Nature  
- Will-O-Wisp  
- Flame Charge  
- Outrage  
- Flare Blitz
Flame Charge -> Outrage if reading Scarf, otherwise Wisp -> Outrage

Gyarados-Mega @ Gyaradosite  
Ability: Intimidate  
EVs: 252 HP / 60 Atk / 12 Def / 80 SpD / 104 Spe  
Adamant Nature  
- Dragon Dance  
- Outrage  
- Waterfall / Crunch / Ice Fang
- Taunt / Stone Edge
Dragon Dance -> Outrage or Ice Fang

Ice Punch

Metagross-Mega @ Metagrossite  
Ability: Clear Body  
EVs: 112 HP / 28 Atk / 252 SpD / 116 Spe  
Careful Nature  
- Ice Punch  
- Bullet Punch  
- Meteor Mash  
- Magnet Rise / Rock Tomb
252+ Atk Choice Band Dragonite Earthquake vs. 112 HP / 0 Def Metagross-Mega: 260-306 (79 - 93%) -- guaranteed 2HKO
252+ SpA Dragonite Inferno Overdrive (185 BP) vs. 112 HP / 252+ SpD Metagross-Mega: 248-294 (75.3 - 89.3%) -- guaranteed 2HKO
100 Atk Dragonite Extreme Speed vs. 112 HP / 0 Def Metagross-Mega: 28-33 (8.5 - 10%) -- possibly the worst move ever
Magnet Rise or Rock Tomb -> Ice Punch if reading Scarf, otherwise Ice Punch x2 or Rock Tomb -> Ice Punch

Medicham-Mega @ Medichamite  
Ability: Pure Power  
EVs: 140 HP / 168 Atk / 4 SpD / 196 Spe  
Adamant Nature  
- Fake Out  
- Ice Punch  
- High Jump Kick  
- Substitute / Endure / Zen Headbutt / Rock Tomb
252+ Atk Dragonite Outrage vs. 140 HP / 0 Def Medicham-Mega: 253-298 (85.4 - 100.6%) -- 6.3% chance to OHKO
Fake Out -> Ice Punch
Dragonite has counterplay against Fake Out if running Protect, which can be defeated by a turn 1 Substitute.
Endure beats Scarf Fly which is relatively uncommon. A second STAB, Sub, or speed control is generally preferred.

Lopunny-Mega @ Lopunnite  
Ability: Limber  
EVs: 120 HP / 144 Atk / 196 Def / 48 Spe  
Adamant Nature  
- Fake Out  
- Ice Punch  
- High Jump Kick  
- Giga Impact
252 Atk Dragonite Fly vs. 120 HP / 196 Def Lopunny-Mega: 260-308 (86.3 - 102.3%) -- 12.5% chance to OHKO
Fake Out -> Ice Punch
If you don't care about losing to Scarf Fly, an alternative EV spread can be used to max out speed and attack while still bulking Scarf Outrage.
EVs: 244 Atk / 12 Def / 252 Spe, Jolly or Adamant Nature  

Aggron-Mega @ Aggronite  
Ability: Sturdy  
EVs: 240 HP / 116 SpD / 152 Spe  
Careful Nature  
- Rock Tomb  
- Ice Punch  
- Heavy Slam  
- Protect / Metal Burst
252+ SpA Dragonite Inferno Overdrive (185 BP) vs. 240 HP / 116+ SpD Filter Aggron-Mega: 264-312 (77.4 - 91.4%) -- guaranteed 2HKO
Rock Tomb -> Ice Punch

Avalanche

Aggron @ Choice Band  
Ability: Sturdy  
EVs: 240 HP / 252 Atk / 16 Def  
Adamant Nature  
IVs: 6 Spe  
- Avalanche  
- Head Smash  
- Heavy Slam  
- Superpower / Earthquake
252+ Atk Choice Band Aggron Avalanche vs. 252 HP / 32 Def Multiscale Dragonite: 386-456 (100 - 118.1%) -- guaranteed OHKO
Avalanche

Avalugg @ Choice Band  
Ability: Sturdy  
EVs: 240 HP / 248 Atk / 20 SpD  
Adamant Nature  
- Avalanche  
- Superpower  
- Stone Edge  
- Mirror Coat
248+ Atk Choice Band Avalugg Avalanche vs. 252 HP / 252+ Def Multiscale Dragonite: 446-528 (115.5 - 136.7%) -- guaranteed OHKO
Avalanche

Mamoswine @ Choice Band  
Ability: Thick Fat  
EVs: 132 Atk / 124 Def / 252 Spe  
Jolly Nature  
- Icicle Crash  
- Ice Shard  
- Earthquake  
- Icicle Spear
252+ Atk Dragonite Superpower vs. 0 HP / 124 Def Mamoswine: 306-360 (84.7 - 99.7%) -- guaranteed 2HKO
132 Atk Choice Band Mamoswine Icicle Crash vs. 252 HP / 32 Def Multiscale Dragonite: 386-456 (100 - 118.1%) -- guaranteed OHKO
Icicle Crash or Icicle Spear (3 hits)

Icium Z

Victini @ Icium Z  
Ability: Victory Star  
EVs: 248 HP / 60 SpA / 4 SpD / 196 Spe  
Modest Nature  
IVs: 0 Atk  
- Will-O-Wisp  
- Glaciate  
- Blue Flare  
- Taunt
Will-O-Wisp -> Z-Glaciate

Greninja @ Icium Z  
Ability: Protean  
EVs: 76 HP / 132 Def / 48 SpA / 252 Spe  
Timid Nature  
- Protect  
- Shadow Sneak  
- Blizzard  
- Hydro Cannon
252+ Atk Dragonite Outrage vs. 76 HP / 132 Def Greninja: 256-303 (84.2 - 99.6%) -- guaranteed 2HKO
48 SpA Protean Greninja Subzero Slammer (185 BP) vs. 252 HP / 108 SpD Multiscale Dragonite: 386-456 (100 - 118.1%) -- guaranteed OHKO
If reading Scarf, Protect T1. If they Outrage, go for Z-Blizzard. If they Superpower, use Shadow Sneak first to avoid damage then Z-Blizzard the following turn.
If reading Dragon Dance, use Z-Blizzard T1. Protect T1 is safe versus any 4-attack variant of Dragonite.

Jirachi @ Icium Z  
Ability: Serene Grace  
EVs: 48 HP / 252 SpA / 12 SpD / 196 Spe  
Modest Nature  
IVs: 0 Atk  
- Skill Swap  
- Icy Wind  
- Protect  
- Psychic
252+ SpA Dragonite Inferno Overdrive (185 BP) vs. 48 HP / 12 SpD Multiscale Jirachi: 182-215 (51.5 - 60.9%) -- guaranteed 2HKO
252+ SpA Dragonite Inferno Overdrive (185 BP) vs. 48 HP / 12 SpD protected Jirachi: 91-107 (25.7 - 30.3%) -- guaranteed 4HKO
252+ SpA Dragonite Fire Blast vs. 48 HP / 12 SpD Jirachi: 216-256 (61.1 - 72.5%) -- guaranteed 2HKO
252+ Atk Dragonite Earthquake vs. 48 HP / 0 Def Jirachi: 246-290 (69.6 - 82.1%) -- guaranteed 2HKO
252+ SpA Jirachi Subzero Slammer (100 BP) vs. 252 HP / 28 SpD Serene Grace Dragonite: 388-460 (100.5 - 119.1%) -- guaranteed OHKO
Protect can be used to scout for Scarf Earthquake. Icy Wind -> Z-Icy Wind slows down and 2hkos Scarf Dragonite. 
Skill Swap -> Z-Icy Wind beats all non-Scarf variants of Dragonite.

Jirachi @ Shuca Berry  
Ability: Serene Grace  
EVs: 48 HP / 100 Atk / 204 Def / 4 SpD / 152 Spe  
Adamant Nature  
- Substitute  
- Iron Head  
- Ice Punch  
- Thunder Wave
252+ Atk Choice Band Dragonite Fire Punch vs. 48 HP / 204 Def Jirachi: 226-268 (64 - 75.9%) -- guaranteed 2HKO
252+ SpA Dragonite Fire Blast vs. 48 HP / 4 SpD Jirachi: 218-258 (61.7 - 73%) -- guaranteed 2HKO
Substitute -> (Thunder Wave if DD ->) Iron Head -> Ice Punch

Fairies

Gardevoir-Mega @ Gardevoirite  
Ability: Trace  
EVs: 240 HP / 156 Def / 16 SpA / 96 Spe  
Timid Nature  
IVs: 0 Atk  
- Will-O-Wisp  
- Hyper Beam  
- Hyper Voice  
- Icy Wind
252+ Atk Dragonite Iron Head vs. 240 HP / 156 Def Gardevoir-Mega: 226-268 (67 - 79.5%) -- guaranteed 2HKO
Icy Wind -> Hyper Voice if reading Scarf, otherwise Will-O-Wisp -> Hyper Voice

Tapu Lele @ Psychium Z  
Ability: Psychic Surge  
EVs: 240 HP / 32 Def / 236 Spe  
Modest Nature  
IVs: 0 Atk  
- Skill Swap  
- Psychic  
- Moonblast / Draining Kiss  
- Reflect
+1 252+ Atk Dragonite Supersonic Skystrike (175 BP) vs. 240 HP / 32 Def Tapu Lele through Reflect: 292-344 (85.6 - 100.8%) -- 6.3% chance to OHKO
252+ Atk Dragonite Iron Head vs. 248 HP / 24 Def Tapu Lele: 242-286 (70.5 - 83.3%) -- guaranteed 2HKO
Does not beat Adamant Scarf Iron Head Dragonite (requires Bold Nature, Iron Defense, and Z-Aromatherapy).
Z-Skill Swap -> Reflect -> Draining Kiss beats Dragon Dance Protect Earthquake Z-Fly Dragonite.
Skill Swap -> Z-Psychic beats every other Dragonite.

Diancie-Mega @ Diancite  
Ability: Magic Bounce  
EVs: 240 HP / 104 Def / 48 SpA / 116 Spe  
Modest Nature  
- Rock Tomb  
- Moonblast  
- Diamond Storm  
- Skill Swap
252+ Atk Dragonite Iron Head vs. 240 HP / 104 Def Diancie: 256-304 (85 - 100.9%) -- 6.3% chance to OHKO
If reading Choice Band Iron Head, Mega Skill Swap -> Moonblast
Otherwise, Rock Tomb -> Mega Moonblast

Altaria-Mega @ Altarianite  
Ability: Pixilate  
EVs: 248 HP / 172 Def / 8 SpA / 60 SpD / 20 Spe  
Bold Nature  
IVs: 0 Atk  
- Cotton Guard  
- Roost  
- Hyper Beam  
- Hyper Voice
Cotton Guard -> Roost -> Hyper Voice

Audino-Mega @ Audinite  
Ability: Klutz  
EVs: 248 HP / 172 Def / 88 SpD  
Calm Nature  
IVs: 0 Atk  
- Baby-Doll Eyes  
- Amnesia  
- Rest  
- Icy Wind
Baby-Doll Eyes -> (Amnesia/Eyes ->) Rest -> Icy Wind

Clefable @ Psychium Z  
Ability: Unaware  
EVs: 252 HP / 236 Def / 20 SpD  
Bold Nature  
- Magic Coat  
- Reflect  
- Moonlight  
- Moonblast
Z-Reflect -> Moonlight -> Moonblast

Azumarill @ Fairium Z  
Ability: Huge Power  
EVs: 72 HP / 244 Atk / 192 Def  
Adamant Nature  
- Play Rough  
- Aqua Jet  
- Charm  
- Rest
252+ Atk Dragonite Supersonic Skystrike (175 BP) vs. 72 HP / 192 Def Azumarill: 310-366 (86.3 - 101.9%) -- 12.5% chance to OHKO
244+ Atk Huge Power Azumarill Twinkle Tackle (175 BP) vs. 160 HP / 0 Def Multiscale Dragonite: 358-423 (98.6 - 116.5%) -- 93.8% chance to OHKO
Z-Play Rough

Azumarill @ Icium Z  
Ability: Huge Power  
EVs: 128 HP / 196 Atk / 176 Def / 8 SpD  
Adamant Nature  
- Ice Punch  
- Aqua Jet  
- Play Rough  
- Liquidation / Bulldoze
252+ Atk Dragonite Supersonic Skystrike (175 BP) vs. 128 HP / 176 Def Azumarill: 315-372 (84.4 - 99.7%) -- guaranteed 2HKO
196+ Atk Huge Power Azumarill Subzero Slammer (140 BP) vs. 156 HP / 0 Def Multiscale Dragonite: 362-426 (100 - 117.6%) -- guaranteed OHKO
Z-Ice Punch

Mawile-Mega @ Mawilite  
Ability: Intimidate  
EVs: 252 HP / 4 Atk / 252 SpD  
Careful Nature / Adamant Nature  
- Metal Burst / Protect  
- Ice Punch  
- Play Rough  
- Sucker Punch
-1 252+ Atk Choice Band Dragonite Earthquake vs. 252 HP / 0 Def Mawile-Mega: 204-240 (67.1 - 78.9%) -- guaranteed 2HKO
252+ SpA Dragonite Inferno Overdrive (185 BP) vs. 252 HP / 252+ SpD Mawile-Mega: 274-324 (90.1 - 106.5%) -- 43.8% chance to OHKO
252+ SpA Dragonite Inferno Overdrive (185 BP) vs. 252 HP / 252 SpD protected Mawile-Mega: 75-89 (24.6 - 29.2%) -- 99.9% chance to 4HKO
252+ SpA Dragonite Fire Blast vs. 252 HP / 252 SpD Mawile-Mega: 180-212 (59.2 - 69.7%) -- guaranteed 2HKO
Careful Metal Burst beats max spA Firium Z Dragonite 56.2% of the time. If you would like to avoid this roll,
Adamant Protect -> Ice Punch/PR -> Sucker Punch wins reliably versus Dragonite's Inferno Overdrive -> Fire Blast combo.

Tapu Fini @ Fairium Z  
Ability: Misty Surge  
EVs: 248 HP / 28 SpA / 16 SpD / 216 Spe  
Timid Nature  
IVs: 0 Atk  
- Substitute  
- Icy Wind  
- Moonblast  
- Calm Mind
Substitute -> Icy Wind -> Z-Moonblast

Primarina @ Primarium Z  
Ability: Torrent  
EVs: 240 HP / 32 Def / 100 SpA / 136 Spe  
Modest Nature  
IVs: 0 Atk  
- Protect  
- Icy Wind  
- Moonblast  
- Sparkling Aria
If reading Supersonic Skystrike, use Protect to absorb the hit
otherwise, Icy Wind -> Moonblast 2HKOs Dragonite.

Ice Beam

Manaphy @ Waterium Z  
Ability: Hydration  
EVs: 12 HP / 188 Def / 112 SpA / 196 Spe  
Modest Nature  
IVs: 0 Atk  
- Acid Armor / Charm  
- Icy Wind  
- Ice Beam  
- Surf
Acid Armor -> Icy Wind -> Ice Beam

Swampert-Mega @ Swampertite  
Ability: Damp  
EVs: 208 HP / 16 Atk / 36 SpA / 248 SpD  
Brave Nature  
- Yawn  
- Protect  
- Ice Beam  
- Earthquake
Yawn -> Protect -> Ice Beam x2

Blastoise-Mega @ Blastoisinite  
Ability: Torrent  
EVs: 216 HP / 136 SpA / 44 SpD / 112 Spe  
Modest Nature  
- Fake Out  
- Ice Beam  
- Hydro Cannon  
- Aura Sphere / Substitute / Icy Wind
Fake Out -> Ice Beam

Regice @ Sitrus Berry  
Ability: Clear Body  
EVs: 248 HP / 108 Def / 152 Spe  
Bold Nature  
IVs: 0 Atk  
- Icy Wind  
- Ice Beam  
- Amnesia  
- Rest
Icy Wind -> Ice Beam

Froslass (F) @ King's Rock  
Ability: Cursed Body  
EVs: 172 Def / 144 SpA / 192 Spe  
Timid Nature  
- Protect  
- Fling  
- Icy Wind  
- Ice Beam
If reading Choice Scarf, scout with Protect then Icy Wind -> Ice Beam
Fling -> Ice Beam beats non-scarf Dragonite.

Bulky Psychics 

Mew @ Kee Berry  
Ability: Synchronize  
EVs: 252 HP / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Will-O-Wisp  
- Roost  
- Amnesia / Seismic Toss  
- Taunt / Seismic Toss / Barrier
Will-O-Wisp -> Roost -> Seismic Toss
Amnesia improves the matchup vs Special Dragonite. Barrier, Taunt, or Seismic Toss improve the matchup vs Dragon Dance Dragonite.

Alakazam-Mega @ Alakazite  
Ability: Magic Guard  
EVs: 56 HP / 220 Def / 20 SpA / 212 Spe  
Timid Nature  
IVs: 0 Atk  
- Hidden Power [Ice]  
- Barrier  
- Recover  
- Psychic
Barrier -> Recover -> HP Ice

Slowbro-Mega @ Slowbronite  
Ability: Oblivious  
EVs: 252 HP / 4 Def / 252 SpD  
Sassy Nature  
IVs: 0 Atk / 0 Spe  
- Scald  
- Iron Defense  
- Calm Mind  
- Slack Off
Iron Defense -> Slack Off -> Scald

Deoxys-Speed @ Leftovers  
Ability: Pressure  
EVs: 240 HP / 252 Def / 16 SpD  
Timid Nature  
IVs: 0 Atk  
- Iron Defense  
- Recover  
- Substitute / Taunt  
- Amnesia / Taunt
Iron Defense -> (Taunt ->) Recover -> Substitute -> etc
Taunt is best vs Dragon Dance, Amnesia is best vs Special Dnite, Sub can also be used vs Special Dnite and is good insurance against crits.

Musharna @ Wiki Berry  
Ability: Forewarn  
EVs: 244 HP / 168 Def / 96 SpD  
Calm Nature  
IVs: 0 Atk  
- Calm Mind  
- Barrier  
- Stored Power  
- Moonlight
Barrier -> Moonlight -> Calm Mind -> Stored Power

Phys Def Recovery

Sableye-Mega @ Sablenite  
Ability: Magic Bounce  
EVs: 248 HP / 48 Def / 212 SpD  
Bold Nature  
IVs: 0 Atk  
- Will-O-Wisp  
- Recover  
- Foul Play  
- Calm Mind
Will-O-Wisp -> Recover -> Foul Play

Chansey (F) @ Eviolite  
Ability: Natural Cure  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
IVs: 0 Atk  
- Counter  
- Charm  
- Toxic / Ice Beam  
- Soft-Boiled
If reading Choice Band, Counter
If reading Substitute, Ice Beam
Otherwise, Charm -> Soft-Boiled -> Toxic/Ice Beam

Blissey (F) @ Fairium Z  
Ability: Natural Cure  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
IVs: 0 Atk  
- Counter  
- Charm  
- Toxic / Ice Beam  
- Soft-Boiled
If reading Choice Band, Counter
If reading Substitute, Ice Beam
Otherwise, Z-Charm -> Soft-Boiled -> Toxic/Ice Beam

Porygon-Z @ Normalium Z  
Ability: Adaptability  
EVs: 80 HP / 252 Def / 176 Spe  
Timid Nature  
IVs: 0 Atk  
- Shadow Ball  
- Conversion  
- Recover  
- Hyper Beam 
Does not beat Dragon Dance Dragonite.
Z-Conversion -> Recover -> Shadow Ball beats any 4-attack Dragonite.

Porygon2 @ Eviolite  
Ability: Trace  
EVs: 252 HP / 172 Def / 84 SpD  
Bold Nature  
IVs: 0 Atk / 0 Spe  
- Toxic  
- Recover  
- Ice Beam  
- Foul Play
Ice Beam -> Recover -> Toxic/Foul Play/Ice Beam -> Recover

Sub Seed Stall

Jumpluff @ Leftovers  
Ability: Chlorophyll  
EVs: 20 HP / 236 Def / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sleep Powder  
- Substitute  
- Protect  
- Leech Seed
Sleep Powder -> Sub -> Leech -> Protect -> Sleep -> Sub -> etc

Celesteela @ Leftovers  
Ability: Beast Boost  
EVs: 232 HP / 24 Def / 252 SpD  
Bold Nature  
IVs: 0 Atk  
- Leech Seed  
- Protect  
- Substitute  
- Autotomize
252+ SpA Dragonite Inferno Overdrive (185 BP) vs. 232 HP / 252 SpD Celesteela: 290-342 (73.7 - 87%) -- guaranteed 2HKO
252+ SpA Dragonite Fire Blast vs. 232 HP / 252 SpD Celesteela: 172-204 (43.7 - 51.9%) -- guaranteed 3HKO
252+ Atk Choice Band Dragonite Fire Punch vs. 232 HP / 24+ Def Celesteela: 238-282 (60.5 - 71.7%) -- guaranteed 2HKO
Leech Seed -> Protect -> Autotomize -> Protect -> Substitute -> Protect -> Substitute -> etc

Whimsicott @ Leftovers  
Ability: Prankster  
EVs: 240 HP / 108 Def / 92 SpD / 68 Spe  
Bold Nature  
IVs: 0 Atk  
- Leech Seed  
- Protect  
- Substitute  
- Moonblast
Substitute -> Leech Seed -> Protect -> Substitute -> Protect -> etc

Venusaur-Mega @ Venusaurite  
Ability: Chlorophyll  
EVs: 208 HP / 128 Def / 172 Spe  
Timid Nature  
IVs: 0 Atk  
- Substitute  
- Leech Seed  
- Charm / Sleep Powder  
- Sludge Bomb / Sleep Powder
Loses to Jolly and Timid Flyinium Dragonite (uncommon)
Substitute -> (Charm/Sleep ->) Leech -> Substitute

Dragonium Z

Zeraora @ Dragonium Z  
Ability: Volt Absorb  
EVs: 32 HP / 252 Atk / 24 Def / 200 Spe  
Jolly Nature  
- Fake Out  
- Outrage  
- Plasma Fists  
- Bulk Up / Substitute
252 Atk Dragonite Earthquake vs. 32 HP / 24 Def Zeraora: 274-324 (84.3 - 99.6%) -- guaranteed 2HKO
Fake Out -> Z-Outrage

Zeraora @ Life Orb  
Ability: Volt Absorb  
EVs: 16 HP / 244 Atk / 120 Def / 128 Spe  
Jolly Nature  
- Fake Out  
- Outrage  
- Plasma Fists  
- Bulk Up / Substitute
252 Atk Dragonite Earthquake vs. 16 HP / 120 Def Zeraora: 244-288 (76 - 89.7%) -- guaranteed 2HKO after Life Orb damage
Fake Out -> Outrage

Zygarde @ Dragonium Z  
Ability: Power Construct  
EVs: 188 HP / 104 Atk / 216 Spe  
Jolly Nature  
- Substitute  
- Coil  
- Outrage  
- Thousand Arrows / Dragon Dance
Substitute -> Coil -> Z-Outrage

Rock Tomb & Haban
Kyurem @ Haban Berry  
Ability: Pressure  
EVs: 120 HP / 252 Def / 136 Spe  
Timid Nature  
- Rock Tomb  
- Ice Beam  
- Draco Meteor  
- Earth Power
Rock Tomb -> Ice Beam

Garchomp @ Haban Berry  
Ability: Rough Skin  
EVs: 248 HP / 16 Atk / 44 Def / 120 SpD / 80 Spe  
Jolly Nature  
- Substitute  
- Rock Tomb  
- Outrage  
- Earthquake
Substitute -> Rock Tomb -> Outrage

Gliscor @ Toxic Orb  
Ability: Poison Heal  
EVs: 56 HP / 216 Atk / 236 Spe  
Impish Nature  
- Substitute  
- Protect  
- Rock Tomb  
- Ice Fang
Sub -> (Protect ->) Rock Tomb -> Ice Fang

Mold Breaker

Haxorus @ Choice Scarf  
Ability: Mold Breaker  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Outrage  
- Superpower  
- Earthquake  
- Iron Tail / Poison Jab
252+ Atk Mold Breaker Haxorus Outrage vs. 252 HP / 252 Def Dragonite: 386-456 (100 - 118.1%) -- guaranteed OHKO
Outrage

Hawlucha @ Rockium Z  
Ability: Mold Breaker  
EVs: 144 HP / 252 Atk / 112 Spe  
Adamant Nature  
- Stone Edge  
- Substitute  
- Bulk Up  
- High Jump Kick
252+ Atk Mold Breaker Hawlucha Continental Crush (180 BP) vs. 156 HP / 4 Def Dragonite: 354-418 (97.7 - 115.4%) -- 87.5% chance to OHKO
Z-Stone Edge

Char Y Check

Charizard-Mega-Y @ Charizardite Y  
Ability: Drought  
EVs: 120 HP / 84 Def / 200 SpA / 104 Spe  
Modest Nature  
- Will-O-Wisp  
- Hidden Power [Ice]  
- Flame Charge  
- Blast Burn
Loses to Choice Scarf
Will-O-Wisp -> Hidden Power [Ice]

Charizard-Mega-Y @ Charizardite Y  
Ability: Drought  
EVs: 240 HP / 252 Def / 16 Spe  
Bold Nature  
IVs: 0 Atk  
- Counter  
- Will-O-Wisp  
- Hidden Power [Ice] / Solar Beam  
- Blast Burn
252+ Atk Choice Scarf Dragonite Rock Slide vs. 240 HP / 252+ Def Charizard-Mega-Y: 312-368 (87.3 - 103%) -- 18.8% chance to OHKO
Counter

Choice Band Lures

Magearna @ Shuca Berry  
Ability: Soul-Heart  
EVs: 252 HP / 100 Def / 20 SpA / 136 Spe  
Bold Nature  
IVs: 0 Atk  
- Iron Defense  
- Pain Split  
- Fleur Cannon  
- Calm Mind
Loses to Firium Z Dragonite
Iron Defense -> Pain Split -> Fleur Cannon

Magearna @ Occa Berry  
Ability: Soul-Heart  
EVs: 248 HP / 8 Def / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Iron Defense  
- Pain Split  
- Fleur Cannon  
- Calm Mind
Loses to Fast (>251 Speed) Choice Band Dragonite
Iron Defense -> Pain Split -> Fleur Cannon

Tyranitar @ Chople Berry  
Ability: Sand Stream  
EVs: 40 HP / 108 Atk / 252 Def / 108 Spe  
Impish Nature  
- Rock Tomb  
- Stone Edge  
- Crunch  
- Counter
Counter if reading Scarf, otherwise Rock Tomb -> Stone Edge

Mirror Matchup

Dragonite @ Dragonium Z  
Ability: Multiscale  
EVs: 252 Atk / 4 Def / 252 Spe  
Adamant Nature  
- Outrage  
- Dragon Dance  
- Extreme Speed  
- Earthquake  
Z-Outrage -> Extreme Speed

Dragonite @ Icium Z  
Ability: Multiscale  
EVs: 32 HP / 220 Def / 248 SpA / 8 SpD  
Modest Nature  
- Blizzard  
- Extreme Speed  
- Icy Wind  
- Draco Meteor
252+ Atk Choice Band Dragonite Outrage vs. 32 HP / 220 Def Multiscale Dragonite: 277-327 (83.6 - 98.7%) -- guaranteed 2HKO
252+ Atk Dragonite Devastating Drake (190 BP) vs. 32 HP / 220 Def Multiscale Dragonite: 292-345 (88.2 - 104.2%) -- 25% chance to OHKO
252+ SpA Dragonite Devastating Drake (195 BP) vs. 32 HP / 8 SpD Multiscale Dragonite: 288-340 (87 - 102.7%) -- 18.8% chance to OHKO
248+ SpA Dragonite Subzero Slammer (185 BP) vs. 248 HP / 0 SpD Multiscale Dragonite: 368-434 (95.5 - 112.7%) -- 75% chance to OHKO
Z-Blizzard -> Extreme Speed