Never tried in earnest...always would get bored and restart the game. I'm working on it now in LeafGreen. I'm up to 100 Pokémon as I just added 8 yesterday (Pidgeot, Parasect, Dewgong, Dodrio, Graveler, Kingler, Persian, and Rapidash). Unfortunately I don't have a means of trading as my little brother cannot find his GBA right now, but I'll go for the 125 Pokémon that I can get without trading and see how it stands then. Chansey, Tauros, and Kangaskhan are gonna give me headaches, though. >_>