Gameshark + Game Genie codes on Mew

Red/ Blue Game Shark Codes

0115D8CF Every random battle will be Mew

011564D1 The Pokemon at the top of your list will be Mew

01F00ED7 Mew will be in the grass between Cerulean and the Power Plant

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Red/ Blue Game Genie Codes

151-91a-7fc

151-93a-f7e

151-9ba-6eg Mew will be in the grass west of Cerulean

070-709-334

560-D9A-329 All the people walk around even if they're normally still. This means that the guy who asks for your ticket will be walking off somewhere so you can explore the area around the S.S. Anne. I haven't tested this one.

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Pokémon Pinball Game Shark Codes

919679D5 Every random battle will be w/ Mew

91057AD5 Infinite Time to hit Mew (3 million pts per hit!)