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>Catch red gyarados
>Send through the time capsule to gen 1
>Teach it mimic
>Encounter a wild ditto
>Outspeed it and mimic transform
>Ditto transforms into gyarados
>The game detects a pokemon used transform, therefore it must be a ditto, so revert it to the stats it had before it used transform if caught
>Sit and stall for time until ditto-gyarados uses transform again
>Ditto-gyarados transforms into gyarados again
>The game detects a pokemon used transform, therefore it must be a ditto, so revert it to the stats it had before it used transform if caught (which are the transformed gyarados' stats)
>Catch the twice-transformed ditto
>Send it through the time capsule to gen 2
>Enjoy your FREE SHINY DITTO