User blog comment:TinyCastleGuy/Random VIP/@comment-1455034-20120811025834/@comment-1455034-20120813133345

Ditto is sometimes a good pokemon. In generation 4 (SoulSilver is generation 4), Ditto copies (I think)v the exact stats of a pokemon, except health, which is a pity. If you really want to become an expert at Pokemon, try reading up about EVs, IVs, STAB, Damage Modification, type effectiveness, read up on Pokemon moves, breeding for SoulSilver (as it is quite dfferent than breeding in other Generation 4 games), and abilities. I think I may have missed some, but reading up about STAB, type effectiveness, and damage modification can be really helpful, as you learn what each vague message means when Bulbapedia explains it.

And believe me, the Pokemon games are chock full of vague messages. Along with that, try to understand how Base Stats work. And definitely do  NOT   use the wikia The Pokemon Wiki. I laughed so hard yesterday seeing how much lies upon lies they have their, how people there write articles horribly (most not even in third person!), the exceptionally poor leardership there, and how they are constantly stealing from Bulbapedia, and have content on pages taken from Wikipedia, with some of the pages lacking the "Wikipedia attribution" template.