Mythical horse (Keldeo) @ Choice Scarf  
Ability: Justified  
Tera Type: Ground  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
- Surf  
- Secret Sword  
- Flip Turn  
- Tera Blast  

Maybe a horse (Arceus-Fairy) @ Pixie Plate  
Ability: Multitype  
Tera Type: Steel  
EVs: 252 HP / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Judgment  
- Recover  
- Will-O-Wisp  
- Taunt  

Flutter Horse (Spectrier) @ Leftovers  
Ability: Grim Neigh  
Tera Type: Fairy  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Shadow Ball  
- Nasty Plot  
- Draining Kiss  
- Taunt  

Has horse in name (Kingdra) @ Scope Lens  
Ability: Sniper  
Tera Type: Water  
EVs: 4 Def / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Draco Meteor  
- Surf  
- Focus Energy  
- Agility  

Almost a horse (Mudsdale) @ Leftovers  
Ability: Stamina  
Tera Type: Dark  
EVs: 252 HP / 4 Def / 252 SpD  
Careful Nature  
- Stealth Rock  
- Earthquake  
- Roar  
- Smack Down  

Dead in 2050 (Glastrier) @ Heavy-Duty Boots  
Ability: Chilling Neigh  
Tera Type: Grass  
EVs: 4 HP / 252 Atk / 252 Spe  
Jolly Nature  
- Trailblaze  
- Swords Dance  
- Icicle Crash  
- High Horsepower