This game is a pet simulation game developed by Nintendo starring Pikachu. What is unique about this game is that it uses the Voice Recognition Unit accessory for the Nintendo 64 to enable the player to be able to talk to Pikachu. The levels have you and Pikachu doing things such as looking for food ingredients and helping Pikachu hit a piñata. There is also a shop system in the game, used to buy new items.
If you say "Playstation" at the Voice Recognition Unit, Pikachu will get mad at you.