no! only the newest gen of pokemon appear!
Only until you beat the Elite 4 for the first time! D:
yeah, only until you beat the game lol :P
Yeah.. the game.. except
hunting down the seven sages, battling the trainers that are stronger than the elite 4 were, capturing the legendaries, and rematching the elite 4 with their full strength instead of the half-assed crap you fight for the story and finally ending in a battle against the actual champion this time. Oh and fighting Cynthia in her holiday home.
And the usual building a team for online play if you're into that. :|
So yeah, they don't have the same huge post-game that Grey will have, but there's still a fair bit to do. :x