all i know about it is that you have a free battle system (you dont enter a battle you attack on the field) and you get to be a pokemon at least, thats the only things i heard about it.
heres a video i found on the blue version:
http://www.youtube.com/watch?v=ILJ60cUPn5g
Don't make me ice-cream truck kamikaze your face! (Accidental attack on Kirby Air-Ride... self-explanitory)
... Go Team Arbitrary!!!