Walkthrough:Pokémon Ranger/Part 19

With the Go-Rock Squad gone, a lot of Pokémon have found it safe to come out again in areas you've been before.

Regirock can be found in the Sekra Range, just before the entrance to the Fiore Temple. It can only be reached by completing the following steps.

Pokémon		Assist	Field	Loops
	Regirock	Rock	None	20

Regice can be found in Panula Cave. It can only be reached by completing the following steps.

Use Burn on the Ice and enter into the room that is revealed.
Avoid the holes on the icy floor then use Crush on the right-hand Boulder to reveal a hole.
Drop down the hole and use Cross on the Post to get over the water.
Drop into the next hole you come across to reach the door to Regice's chamber.
Enter into the chamber to meet Regice.

Pokémon		Assist	Field	Loops
	Regice	Ice	None	13

Registeel can be found within the Krokka Tunnel's depths. The following steps must be completed to reach it.

Use Cross on the Post to get over the water.
Head south down the tunnel until dropping down. Travel west and enter the doorway.
Use Crush on at least four Boulders to reach a chasm.
Use Cross on the Post to get over the chasm.
Head north and enter the chamber to meet Registeel.