I wasn't going to main PT (along with sheik) when I realized the pokemon rotate after each stock even if you pick one to start out with. I assumed it would be like sheik/zelda, when you lose a stock you'd still be using the same pokemon. But now that I know the pokemon fatigue when using the same one too long it is a little better since if you spam the same moves, the attacks will diminish in damage and knock back.
But the question is, if you spam squirtle's fair, then you switch to ivysaur, will her fair still have diminished damage + knockback? If it completely resets after the switch I'll most likely main PT, but I haven't seen anyone discuss this connection.