Pikachu is an Electric-type Mouse Pokemon introduced in Generation I that is the evolved form of Pichu. Pikachu is famous for being the most well-known and recognizable Pokemon in Generations I-V. Over the past years、 Pikachu has become so popular that it serves as the Pokemon franchise mascot. In 1998、 it became a Version Mascot for the game Pokemon Yellow. In the anime、 Ash s Pikachu has extremely strong powers、 this is the reason Team Rocket is after it.