you can only use Action replay or start the game again.
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No you can't change your clothes in Pokemon Platinum.
You cannot change an OT name in Pokémon Platinum.
there is no acro bike on Pokemon platinum, you press B to change gears
it depends what team of Pokemon you have
To change your appearance in Pokemon Platinum's Union Room you need to talk to an NPC in the Oreburgh Pokemon Center. The NPC in question has the appearance of a Psychic trainer.