Audino (F) @ Audinite  
Ability: Healer  
Level: 32  
EVs: 252 HP / 4 Def / 252 SpA  
Modest Nature  
IVs: 0 Atk / 0 Spe  
- Wish  
- Calm Mind  
- Dazzling Gleam  
- Fire Blast  

Checkpoint: Gym Leader Wattson
Format: Single Battle
Theme: Wild Battle
Estimated Difficulty: ★★★★★★★★★★ (10/10)
=============================================================================================================================================================================

Lopunny (F) @ Lopunnite  
Ability: Limber  
Level: 42  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Fake Out  
- Return  
- High Jump Kick  
- Fire Punch  

Checkpoint: Gym Leader Flannery
Format: Single Battle
Theme: Wild Battle
Estimated Difficulty: ★★★★ (4/10)
=============================================================================================================================================================================

Pidgeot (M) @ Pidgeotite  
Ability: Tangled Feet  
Level: 45  
EVs: 4 Def / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Hurricane  
- Heat Wave  
- Rest  
- Sleep Talk  

Checkpoint: Gym Leader Norman
Format: Single Battle
Theme: Gym Leader Battle
Estimated Difficulty: ★★★★★★★★★★ (10/10)
=============================================================================================================================================================================

Aerodactyl (M) @ Aerodactylite  
Ability: Rock Head  
Level: 53  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Wing Attack  
- Earthquake  
- Stone Edge  
- Hone Claws  

Checkpoint: Gym Leader Winona
Format: Single Battle
Theme: Gym Leader Battle
Estimated Difficulty: ★★★★★ (5/10)
=============================================================================================================================================================================

Latias (F) @ Latiasite  
Ability: Levitate  
Level: 63  
EVs: 252 HP / 4 Def / 252 Spe  
Bold Nature  
IVs: 0 Atk  
- Wish  
- Psychic  
- Heal Pulse  
- Charm  

Latios (M) @ Latiosite  
Ability: Levitate  
Level: 63  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Dragon Dance  
- Earthquake  
- Dragon Claw  
- Shadow Claw  

Checkpoint: Gym Leaders Tate & Liza
Format: Double Battle
Theme: Rival Battle
Estimated Difficulty: ★★★★★★ (6/10)
=============================================================================================================================================================================
Hoopa-Unbound @ Tanga Berry  
Ability: Magician  
Level: 68  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Hyperspace Fury  
- Fire Punch  
- Gunk Shot  
- Drain Punch  

Checkpoint: Primal Groudon/Primal Kyogre
Format: Single Battle
Theme: Archie/Maxie Battle
Estimated Difficulty: ★★★★★ (5/10)
=============================================================================================================================================================================
Volcanion @ Assault Vest  
Ability: Water Absorb  
Level: 70  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Steam Eruption  
- Flamethrower  
- Earth Power  
- Sludge Bomb  

Checkpoint: Gym Leader Wallace
Format: Single Battle
Theme: Lugia Battle
Estimated Difficulty: ★★★★★ (5/10)
=============================================================================================================================================================================

Diancie @ Diancite  
Ability: Clear Body  
Level: 89  
EVs: 252 SpA / 4 SpD / 252 Spe  
Hasty Nature  
- Diamond Storm  
- Moonblast  
- Earth Power  
- Protect  

Darkrai @ Dread Plate  
Ability: Bad Dreams  
Level: 89  
EVs: 4 Def / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Dark Void  
- Nasty Plot  
- Dark Pulse  
- Sludge Bomb  

Checkpoint: Champion Steven
Format: Double Battle
Theme: Reshiram/Zekrom Battle
Estimated Difficulty: ★★★★★★★★★★★★ (12/10)
=============================================================================================================================================================================

Mew @ Light Clay  
Ability: Synchronize  
Level: 93  
EVs: 252 HP / 4 Def / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Light Screen  
- Transform  
- Metronome  
- Reflect  

Mewtwo-Mega-Y @ Expert Belt  
Ability: Protean  
Level: 93  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Psystrike  
- Thunderbolt  
- Moonblast  
- Secret Sword  

Checkpoint: Rayquaza, Lorekeeper Zinnia, & Deoxys
Format: Double Battle
Theme: Rival Battle
Estimated Difficulty: ★★★★★ (5/10)
=============================================================================================================================================================================
Arceus @ Leftovers  
Ability: Multitype  
EVs: 4 HP / 252 Atk / 252 Spe  
Jolly Nature  
- Swords Dance  
- Shadow Claw
- Earthquake  
- Extreme Speed  

Rayquaza @ Life Orb  
Ability: Air Lock  
Shiny: Yes  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Dragon Dance  
- Dragon Ascent  
- Earthquake  
- Extreme Speed  

Checkpoint: Champion Steven (Post Delta Episode) - The "Final Boss"
Format: Double Battle
Theme: Zinnia Battle
Estimated Difficulty: ★★★★★★★★★★ (10/10)
=============================================================================================================================================================================
Groudon @ Red Orb  
Ability: Drought  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Swords Dance  
- Precipice Blades  
- Dragon Tail  
- Rock Slide  

Rayquaza @ Life Orb  
Ability: Air Lock  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Dragon Dance  
- Dragon Ascent  
- Earthquake  
- Extreme Speed  

Kyogre @ Blue Orb  
Ability: Drizzle  
EVs: 4 HP / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Water Spout  
- Thunder  
- Ice Beam  
- Hydro Pump  

Checkpoint: N/A (After defeating Post Delta Episode Champion Steven) - The "Bonus Boss"
Format: Triple Battle
Theme: Battle Chatelaine (ORAS)
Estimated Difficulty: ★★★★★★★★ (9/10)
=============================================================================================================================================================================
Reward: Event Hoopa ported into game. https://bulbapedia.bulbagarden.net/wiki/List_of_Japanese_region_serial_code_event_Pok%C3%A9mon_distributions_(Generation_VI)#Mighty_Hoopa