The Ash from the anime? Yes, how else can you explain his Pikachu randomly learning Volt Tackle without being rebred.
If you're asking about Pokemon with the OT Ash in the games, there is nothing inherently wrong with naming your player after the main character of the anime. If you're asking specifically about OT Ash with a TID of 01337, you were just told a Pokemon with that OT+TID was hacked, what do you think?
http://www.serebii.net/pokedex-dp/384.shtml (Sinnoh = Diamond, Pearl, and Platinum).
Yes.
There's a form in the first post for a reason.
That's not actually possible as the games lack a Chinese language option, it's probably either Japanese or Korean.