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>Regirock
Self-repair
Heals 1/4 of its max HP when hit by a Rock move or switching in on Stealth Rock (also removes the rocks), and heals 1/16 HP every turn in Sandstorm.
>Regice
Permafrost
Immunity to Fire moves, Water moves targeted at it become Ice, and any Water or Ice moves it uses have an added 10% freeze chance.
>Registeel
Resilience.
Immune to chip damage and status effects.
>Regieleki
Lightspeed
Prevents all priority moves from being used when it's on the field.
>Regidrago
Indomitable
Ignores its own stat changes, including missing HP (so Dragon Energy is always full power)
>Regigigas
Fatherly Pride
Gets a boost upon switching in for each Regi in battle. +2 defense for Rock, +2 spdef for Ice, +1 defense and spdef for Steel, +2 speed for Eleki, and fully recovers all HP for Drago.