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>Okay, you can only do this in Pokemon Yellow. Go through the game normally with just Pikachu. This means you can't catch any other Pokemon. After you beat the game with only your Pikachu, catch a random Pokemon, and then release your Pikachu. Next, go to Lavender Town and go to where Mr. Fuji was standing in the Pokemon Tower and listen to Pikachu's cry in your Pokedex 150 times. After exiting your Pokedex, you will see this Pokemon approach you! If you do anything but throw a Master Ball at it, it will flee, and you will lose it forever. If you decide to save after this, the entire soundtrack will be replaced with the Dig Dug theme. Catch it and you will get Pikaghost! It will one hit KO everything it touches! If for some reason you caught 5 more Pokemon after releasing Pikachu, it will create a 7th spot in your party!
