In the core series games Pokémon Ruby, Sapphire, Emerald, Omega Ruby, and Alpha Sapphire Separately, Regieleki and Regidrago were sealed in the Crown Tundra's Split-Decision Ruins to prevent them from causing any further destruction and terror. A message was left in braille to whomever would come to discover the Sealed Chamber, whose only access was via an underwater cavern, in the hopes that one day the Pokémon could be tamed.

Regigigas was later deemed too powerful and sealed away in the basement of the Snowpoint Temple, while the three titans it created were spirited to the far-off Hoenn region and locked away in three stone structures, which were then sealed themselves. Regigigas was apparently worshiped by ancient people at one point, as were the original three titans. Long ago, Regigigas is said to have pulled the continents into place, and then created the titans in its image from various materials (an icy mountain, rocks, magma, pure electric energy, and crystallized dragon energy). The Legendary titans have relatively concrete lore compared to other Legendary Pokémon.

7.3 Pocket Monsters Diamond and Pearl: Regigigas Major Capture Operation!!.

7.2 Pokémon Diamond and Pearl Adventure.

5.3 Pokémon Mystery Dungeon: Explorers of Time, Darkness, & Sky.

5.2 Pokémon Mystery Dungeon: Red Rescue Team and Blue Rescue Team/Rescue Team DX.

4.2 Pokémon Diamond, Pearl, Platinum, Brilliant Diamond, and Shining Pearl.

4.1 Pokémon Ruby, Sapphire, Emerald, Omega Ruby, and Alpha Sapphire.

Pokémon Brilliant Diamond and Shining Pearl.

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