Species Clause is odd to be me because eric the espeon is right in that no species clause is logically the default, but players - both competitive and not - think of Pokemon as having species clause automatically. I don't know of anyone who uses two of the same Pokemon even in their in-game teams. Every official competitive tournament has species clause enforced. I don't think Battle Tower or the Stadium-style games allow multiples of the same Pokemon either. Does anyone know what happens in WiFi battles in B&W with regards to species?