The exception to this at present are the Dome trainers, as they aren't really necessary and there's no proper trainer editing tool available for B2W2 yet.
→ The rosters of almost all of the trainers in the game have been edited. Most areas now contain at least 8 Pokémon species, and in most cases, more! You'll be able to attain a complete PokéDex within the limits of the game itself, and the majority of Pokémon are available no later than the seventh badge, meaning you can form basically any team you want! There's a couple legendaries that you can't get until after the Elite Four, but aside from that.
→ The wild Pokémon have been edited in each and every area of the game.
