Regirock is the weakest among them.
Registeel
Yes First, you need to have a Regirock/Registeel/Regice in your party.
Regice: mt coronet exit regirock:sand storm place registeel: iron island order: Regirock regice registeel
how do i get regirock
Regice: Route 105 Regirock: Route 111 Registeel: Route 119
Somewhere
k
YES
no you can't
Regirock, Registeel, and Regice.
migrate from the hoenn region
regirock, regice, registeel