I’m 90% sure this is allowed because Fizz said Pokémon Quest questions were allowed, and so are in-game team questions.
Machamp
Attach a sharing stone and give it bulk up and your party are attacking monsters
Mewtwo Cause he is Mewtwo
Zapdos
Its not good to to have 2 psychic types so Zapdos will cover Machamp's flying type weakness
I'm sorry if you dont include legendaries but you didn't say we couldn't