mewtwo

[Proskill]

which class in its mechanics is most similar to mewtwo?

[apples]

so youre asking which class is simultaneously the strongest and weakest and is unique so there can only be one of them?

warlock

[A Chozo]

Shadow Priest.

All your spells are purple, you are light as a feather, and your mental powers are beyond others. Some say Ridley (or is it Pichu?) can still counter you tho.