JellyBird

Nihilego @ Black Sludge  
Ability: Beast Boost  
EVs: 252 HP / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Power Gem  
- Clear Smog  
- Protect  
- Toxic Spikes  

Lugia @ Leftovers  
Ability: Pressure  
EVs: 252 HP / 88 Def / 168 Spe  
Timid Nature  
IVs: 0 Atk  
- Psychic  
- Substitute  
- Calm Mind  
- Roost  

Zygarde-Complete @ Groundium Z  
Ability: Power Construct  
EVs: 220 Atk / 56 SpD / 232 Spe  
Adamant Nature  
- Dragon Dance  
- Thousand Arrows  
- Substitute  
- Toxic  

Ferrothorn @ Leftovers  
Ability: Iron Barbs  
EVs: 252 HP / 4 Def / 252 SpD  
Sassy Nature  
- Spikes  
- Protect  
- Leech Seed  
- Power Whip  

Arceus-Fairy @ Pixie Plate  
Ability: Multitype  
EVs: 252 HP / 4 Def / 252 Spe  
Timid Nature  
- Judgment  
- Stealth Rock  
- Recover  
- Will-O-Wisp  

Ditto @ Choice Scarf  
Ability: Imposter  
EVs: 248 HP / 8 Atk / 252 Def  
Relaxed Nature  
IVs: 0 Spe  
- Transform  

Tree Needs Glasses

Xerneas @ Choice Specs  
Ability: Fairy Aura  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Moonblast  
- Focus Blast  
- Thunderbolt  
- Aromatherapy  

Landorus-Therian @ Rocky Helmet  
Ability: Intimidate  
EVs: 252 HP / 4 Atk / 252 Def  
Impish Nature  
- Earthquake  
- U-turn  
- Stealth Rock  
- Stone Edge  

Necrozma-Dusk-Mane @ Ultranecrozium Z  
Ability: Prism Armor  
EVs: 32 Def / 224 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Power Gem  
- Photon Geyser  
- Heat Wave  
- Dragon Pulse  

Magearna @ Leftovers  
Ability: Soul-Heart  
EVs: 252 HP / 4 Def / 252 SpD  
Calm Nature  
- Heart Swap  
- Fleur Cannon  
- Volt Switch  
- Pain Split  

Gyarados-Mega @ Gyaradosite  
Ability: Intimidate  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Dragon Dance  
- Taunt  
- Crunch  
- Waterfall  

Kartana @ Choice Scarf  
Ability: Beast Boost  
EVs: 4 HP / 252 Atk / 252 Spe  
Jolly Nature  
- Leaf Blade  
- Sacred Sword  
- Smart Strike  
- Defog  

Mewdininja

Mewtwo-Mega-X @ Mewtwonite X  
Ability: Pressure  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Taunt  
- Low Kick  
- Zen Headbutt  
- Stone Edge  

Greninja-Ash @ Choice Specs  
Ability: Battle Bond  
EVs: 4 Def / 252 SpA / 252 Spe  
Timid Nature  
- Hydro Pump  
- Dark Pulse  
- Water Shuriken  
- Grass Knot  

Ho-Oh @ Flyinium Z  
Ability: Regenerator  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Sacred Fire  
- Brave Bird  
- Recover  
- Toxic  

Magearna @ Leftovers  
Ability: Soul-Heart  
EVs: 252 HP / 4 Def / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Heart Swap  
- Fleur Cannon  
- Volt Switch  
- Heal Bell  

Giratina-Origin @ Griseous Orb  
Ability: Levitate  
EVs: 232 Def / 252 SpA / 24 Spe  
Modest Nature  
IVs: 0 Atk  
- Defog  
- Hex  
- Draco Meteor  
- Will-O-Wisp  

Arceus-Ground @ Earth Plate  
Ability: Multitype  
EVs: 252 HP / 64 Def / 192 Spe  
Timid Nature  
IVs: 0 Atk  
- Judgment  
- Recover  
- Ice Beam  
- Stealth Rock  

Zshaymin

Tapu Koko @ Leftovers  
Ability: Electric Surge  
EVs: 240 SpA / 16 SpD / 252 Spe  
Timid Nature  
- Thunderbolt  
- U-turn  
- Defog  
- Roost  

Shaymin @ Grassium Z  
Ability: Natural Cure  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Seed Flare  
- Earth Power  
- Hidden Power [Rock]  
- Aromatherapy  

Slowbro-Mega @ Slowbronite  
Ability: Regenerator  
EVs: 252 HP / 252 Def / 4 SpD  
Bold Nature  
- Toxic  
- Scald  
- Slack Off  
- Iron Defense  

Arceus-Dark @ Dread Plate  
Ability: Multitype  
EVs: 252 HP / 4 SpA / 252 Spe  
Timid Nature  
- Judgment  
- Calm Mind  
- Recover  
- Refresh  

Bronzong @ Leftovers  
Ability: Levitate  
EVs: 252 HP / 4 Atk / 252 SpD  
Sassy Nature  
IVs: 0 Spe  
- Gyro Ball  
- Toxic  
- Protect  
- Stealth Rock  

Groudon @ Red Orb  
Ability: Drought  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Rock Polish  
- Swords Dance  
- Earthquake  
- Fire Punch