Pokémon Stadium Kart (multicup based off Pokémon Stadium)

I originally scrapped this idea due to my lack of skills in making custom characters, but I'm trying to revive this idea.

This multicup is inspired by the N64 game Pokémon Stadium. The music for the tracks are from this game too.

Here are the four main cups (named after the stadium's four cups)

Pika Cup:
1: Pikachu Stadium
2: ??? (Will use pika cup battles 4-6)
3: ??? (Will use pika cup semi final)
4: Mount Moon (will use pika cup final)

Petit Cup:
No ideas for the tracks yet... But will use Petit Cup's battle musics

Poké Cup:
1: Pokémon Stadium (will use poké cup battles 1-3)
2: Team Rocket Hideout (will use poké cup battles 4-6)
3: Silph Co. (Will use poké cup semi final)
4: ??? (Will use poké cup final)

Prime Cup:
No ideas for the tracks yet either... But will use Prime Cup's battle musics

Bonus tracks based around locations in Pokémon Stadium (the order is random and not final):

Bonus 1: Kids' Club (will use Kids's Club theme)
Bonus 2: ???
Bonus 3: ???
Bonus 4: Gym Leader Castle

You can help me find ideas depending on what got you a hard time in this game or what thing from the gen 1 games you have in mind from the music.

You can also send collab links for one of the 151 pokémon (or one of the most iconic ones from gen 1, since I think you can't have that many characters in a multicup)

Note: you need to have at least played Pokémon Stadium a lot before requesting ideas.

P.S. I didn't 100% Pokémon Stadium...

Gym Leader Castle has been shared! The Gym Leaders, the Elite Four and the Rival aren't present in the track, though... Maybe I'll add them at a later date?

Isn't Silph Co. just... the Team Rocket hideout itself?