Pokémon Ruby and Sapphire/GameShark

Old Pokémon
Activation code: 492A710538EDD2D9

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New Pokémon
Activation code: 313D2BCE9004E149

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Move cheats
To get these, type the code in the Gameshark, then play and take a heart scale to the Move Tutor in Fallarbor Town and he will teach your Pokémon the move.

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Emerald
These codes change the move learned when a TM or HM is used on a Pokémon. The game will show the old move name.