No.
no
169 is Leafeon, it cannot be caught in the wild in Platinum however its pre-evolved form of Eevee can be gotten by talking to Bebe in Hearthome City then you can take it to the Moss Rock in Eterna Forest and evolve it into Leafeon there.
It was probably traded
when you start your ds change the time to 22:00
Evolve your pokemon them it will turn to it original name. To change the nickname go to the Name Rater in Eterna City. If you can't change the name, the Pokemon is probably traded. If you want to change the name of a traded Pokemon, trade it back to it's original game and change the name.
No you can't change your clothes in Pokemon Platinum.
You cannot change an OT name in Pokémon Platinum.
u can't
there is no acro bike on Pokemon platinum, you press B to change gears
Find the name rater.
it depends what team of Pokemon you have
no you cant
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.
Change the time on your Nintendo DS/DSi
try harder
Eterna City.
no you can't (sorry)