ok so, whos heard of the Action Replay? OK! Its a cheat machine that you use with your Ds Lite, DSI, 3DS.
In soulsilver it gives you the option for the cheat can catch trainer pokemon, which is basically catching a COPY of their pokemon!
If you use this, you WILL fill up your Pokedex faster!
EXAMPLE: Catch all of the Kimono girls's pokemon! Eevee evolutions are hard to find and rare!
Use this cheat and catch all the pokemon you can! (Can only catch one pokemon per battle!)