Lv:150 Mewtwo
Go to the cave with Mewtwo then exit. Fly to city two and talk to the guy who says he just had his coffee get him to show you how to catch pokemon. Then fly to the Cinnabar and surf the right coast. You will find missingnos, golbats, dittos, and a couple other Pokemon, but you have about a 5% chance of finding a mewtwo from lv. 110-150. Hope you have fun with this.
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