Storm Silver blows the doors off the cages. All 493 Pokémon available in Generation 4 are catchable within the game. This includes starters from every previous generation, legendaries from Hoenn and Sinnoh, and elusive evolutions. This single change revolutionizes team building. You are no longer forced to use a Pidgey or a Rattata if you don't want to; you can build a competitive-ready team right from Route 29.