There are only two ways to actually get the Regis legitimately. One was to go to the event that was held at Toy's R' Us and get the level 100 Regigigas which would allow you to unlock the other Regis. If you missed the event though, you'll have to wait and hope for another one. The other way to get them would be to trade it from Diamond/Pearl or migrate them from Sapphire/Ruby/Emerald.
how do i get regirock
Regice: mt coronet exit regirock:sand storm place registeel: iron island order: Regirock regice registeel
Regice: Route 105 Regirock: Route 111 Registeel: Route 119
Regirock, Registeel, and Regice.
you cant
In the cavemap
There is no way to send regice regirock and registeel from ranger to pearl. the only Pokemon that can be transferred from ranger to pearl is the manaphy egg.
Kyogre, Regice, Registeel, and Regirock.
Regice,Regirock,Registeel,and Kyogre
Regirock, Regice, and Registeel.
i don't think you can
You can capture Regigigas.