you have to finish the machine on island one to trade with the ruby, sapphire, and emerald versions.
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Regirock, Registeel, and Regice.
you cant
If you have Regice, Regirock, and Registeel.
you must catch regice,regirock, and registeel
There are four Regi pokemon. They are Regirock, Regice, Registeel, and Regigigas.