To get a pikachu after the first gym make sure you can use cut. go to your house and cut the tree leading to your backyard. once behind your house theres a spot on the back of your house that if you talk to it (make sure you have free pokemon space in pokebelt), text will appear with gibberish pikas and other words, then a a yes/no screen will come up. click YES and more random gibberish will come with a :) to seal the deal. now check your pokemon and you should have a lvl 10 pikachu with its basic moves. you could use a shark code, but this is a more clean way of doing it and you DID NOT cheat the game.