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Regirock, Registeel, and Regice.
Regirock, Regice, and Registeel (and for that matter, Regigigas) are unobtainable in Fire Red and Leaf Green.
If you have Regice, Regirock, and Registeel.
There are four Regi pokemon. They are Regirock, Regice, Registeel, and Regigigas.
you must catch regice,regirock, and registeel