Pokémon Red Glitches

This is a very useful glitch but you need to have access to cinnabar island and surf and fly. go to viridian city talk to the guy, say no and let him teach you how to catch WEEDLE when he's done go to cinnabar and surf along the edge with the masterball on slot 6 of your item list, after youu fight MISSIGNO or the GENTLEMAN you'll have about 130 or more MASTERBALLS but you will see a weird lookin symbol and a 9. get rid of your ultra balls, the masterballs will catch any pokemon regardless of level the first time. thats how i caught MEWTWO