((Keep in mind when I list teams, you may battle them at a younger evoulotion earlier in the game, and I'm just listing what pokemon each of them have in the endgame.))

Team cake admins:

Suisy
Nickname: Suisy Quack

Team:
Swanna
Golduck

Benny
Nickname: Benny Boop

Team
Tentacruel
Elektross

Lee
Nickname: Bear Lee

Team
Ursaring
Raticate

And the main leader...

Dr. Frosting! ....that red stuff is cherry frosting, he says.

Team
Alcreamie
Tropius
Miltank
Slurpuff
Vanilluxe
Pancaktic ⭐

"Bake the future! Make the future! But eat your own- *show ends*" -Him

And this is him, when he's possessed by the legendary for pokemon fallen:

His pokemon get +1 stat buffs when you battle him like this.