One such popular use of the Gameshark for Game Boy was unlocking disabled content. By using cheat codes to modify the move set of Pokemon Yellow's Pikachu to include the move "surf", it would unlock a Surfing Pikachu Mini-Game. A feat that previously required a lengthy and obscure process in Pokemon Stadium while the Pokemon Yellow Cartridge was inserted into the N64 Transfer Pack. A Gameshark was the only way to unlock the mythical Pokemon Mew without knowledge of a very tricky game expolit/glitch or the incredibly rare Nintendo World Mew Distribution Event. Subsequently a Gameshark was also the only way to unlock the Mythical Pokemon Celebi from the 2nd generation of Pokemon Games Silver, Gold, Crystal and Pokemon Stadium 2. This was because the distribution method to catch the mythical Pokemon was disabled in North America due to hardware limitations. A Japanese cell-phone link cable was required.