Buy Colosseum... or XD and a Gamecube(if you dont have one).
I got Meganium, Typhlosion and Feraligatr this way and their Pre-evos by breeding.
What? The Wii Can Play Gamecube?
I read somewhere that if you complete the Kanto dex, you can obtain a Johto starter somehow. Is this true, and if so, where do you get it?
the problem is you can only get one so sending them over to another game like fire red with youre strong ones then starting again all over for the other 2