Generation 3 by far!!!! It was by far the most creative game with loads of creative pokemon and also like a few other members have said, The HM dive rocked because you could go under, the weather effects etc... Also it was kinda like the game that really got me into pokemon... my first pokemon game was yellow, i liked it but it never hit me that but :\...
Oh yeah, AN UNDERWATER CITY!!! HOW KOOL IS THAT!!! RAYQUAZA!!!! BLAZIKEN!!!!!! It was plain awsome... jhoto was kinda boring for me :\