u have to migrate them from ruby Sapphire emerald
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You will find Regirock at rock peak ruins route 228.
how do you catch a mewtwo on Pokemon platinum
you cannot catch the 3 regi's in Pokemon platinum you have to catch them in Pokemon emerald then transfer them to Pokemon platinum. thnx
If you have Regice, Regirock, and Registeel.
you must catch regice,regirock, and registeel