I think this will be a long one since I'm doing 2 characters.

Trainer
Name: Jackie Marishi
Nickname(s): Jacks, Jay
Gender: Female
Age: 10 (anime) 15 (games)
Height: 5'2
Species: Human
Personality: Bright, outgoing, smart, lazy at times, emotional, determined
Looks:

Team:
Skye (Pichu-Pikachu♀)
Hydro (Squirtle-Wartortle-Blastoise ♂)
Falco (Pidgey-Pidgeotto-Pidgeot ♂), Annie (Growlithe-Arcanine♀)
Snorlax ♂
Baja (Sandshrew-Sandslash ♂)

Anime
Best Friend: Ash (then again who wouldn't want to be his best friend lmao)
Frenemies: Gary and Iris
Enemies: Mostly Team Rocket and all the other evil organizations
Rivals: Gary and Ash
Region: She starts in Kanto and moves on from there
Crush: Depends on region
Other: If anyone takes her visor without permission there will be consequences (they aren't serious though lmao)

Games
Most information is, again, based off of the region, which will vary. But if generalized:
Region: Kanto
Rival(s): Blue (and your OC, if you want)

Pokémon
Name: Skye
Gender: Female
Species: Pikachu
Type: Electric
Moves (generations 5 and lower): Thunderbolt, Quick Attack, Charge, Light Screen
Moves (generations 6+): Thunderbolt, Quick Attack, Thunder Punch, Disarming Voice
Looks:

Backstory: Was given to Jackie as a Pichu when the girl was younger, and soon became her partner years later.
Other: She likes to climb trees✨