Right now, the sprite you are viewing comes from Pokémon Ruby and Sapphire Versions. Weezing cannot be found in the wild in these games, but its pre-evolution, Koffing, can be found in the Fiery Path. It is very common in Ruby and very rare in Sapphire.
nothing can stand in your way</big>
there will not be Black and White sequels for ds pokemon gray will be for 3ds