The article states that "After catching Regice, Regirock and Registeel and meeting other special conditions, the player will be able to encounter Regirock." Having watched the trailer I think this should be "encounter Regigigas".
The article states that "After catching Regice, Regirock and Registeel and meeting other special conditions, the player will be able to encounter Regirock." Having watched the trailer I think this should be "encounter Regigigas".