Fly to viridian city and talk to the guy who "just had his coffee", have him teach you how to catch pokemon by answering no. Then fly to fuchsia city and surf to the edge of sea foam islands. Swim along the very edge up and down until tour find a pokemon that looks like a computer chip, make sure you have room for one more pokemon in your party, catch it,dont try to weaken it cause it only has one hp so just catch it. Use a rare candy to get it up one level, then it will evolve into a kanga khan level 100,get it up a level and it will drop to 75, then it will stop and you can raise it higher.