how is it in any way fair to do something like that, if someone uses a different move everyone should have the chance to know 'ok so he might do x so i should watch out for that' like it would be for picking ANY character with a default moveset, not 'ok i lost because he kept x move hidden and would have lost easily if he didn't pull it at the end'
you wouldn't have any time to 'adapt' if it loses you the game right then and there