Regirock resided in the Scorched Slab, to where Sidney was going to. Meanwhile, Steven had a blind boy try to decode the slab that spoke how to awaken Regirock, Regice and Registeel. However, the blind boy failed to decode a part of the slab that was missing. The Elite Four struggled to awaken the Legendary Golems by attacking them. Thus, Sidney had his Zangoose attack Regirock, but failed to awaken it. Fortunately, Sapphire came to Steven with his father's letter, where it was mentioned a Relicanth and a Wailord were required to summon the Legendary Golems. Sapphire used her Relo and Lorry, which emitted beams that awakened the Legendary Golems.
The Elite Four, as well as Steven and Wallace, teamed up with the Legendary Golems. Together, they stood around Sootopolis City to stop Groudon and Kyogre's collision from spreading throughout Hoenn. Sidney was with Drake atop Regirock. However, despite the Legendary Golems halting the collision, the energy from Sootopolis City rose up into air. After Kyogre and Groudon were banished away from Sootopolis City, Steven took a major strain and died from controlling the Legendary Golems, who fled, with their mission over.
Before Emerald took on the Battle Pyramid challenge, Brandon sent out his Regi Pokémon he'd use in the battle, once Emerald climbed the pyramid a certain number of times. Eventually, Brandon faced Emerald, who sent Sceptile against Brandon's Regirock. Regirock started off with Superpower, which Sceptile endured. Since Sceptile launched Leech Seed, Brandon had Regirock finish it off with Explosion. The attack made both Regirock and Sceptile faint. Even if Emerald claimed it was a childish move to use that attack, Brandon claimed he was going all out to defeat him.
While speaking to Noland, Brandon juggled his Poké Balls, containing Regirock, Registeel and Regice.
Brandon's Regirock intimidated Team Aqua and Magma admins; they wanted to know where Zinnia was, but the admins replied she didn't say where she went to.
|Superpower||With a Spoink in Your Step I|
|Explosion||Chipping Away at Regirock|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.
- ^ RS071: The Beginning of the End with Kyogre & Groudon XIII
- ^ RS072: The Beginning of the End with Kyogre & Groudon XIV
- ^ RS073: A Royal Rumble with Regirock, Regice and Registeel I
- ^ RS074: A Royal Rumble with Regirock, Regice and Registeel II
- ^ RS075: With a Spoink in Your Step I
- ^ RS076: With a Spoink in Your Step II
- ^ RS080: It All Ends Now I
- ^ RS081: It All Ends Now II
- ^ RS084: It All Ends Now V
- ^ RS085: It All Ends Now VI
- ^ EM001: Never Spritz a Knotty Sudowoodo
- ^ EM009: A Dust-Up With Dusclops
- ^ EM010: Chipping Away at Regirock
- ^ EM011: You Need to Chill Out, Regice
- ^ EM016: Sneaky Like Shedinja II
- ^ ORAS017