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These guys just needed signature abilities based of thier pokedex entries
>Registeel
Ancient Alloy: Physical damage is reduced by half. (I know this is just fur coat)
>Regice
Unmeltable: This pokemon is immune to fire type moves.
or
Cryogenic contact: Contact with this pokemon has 50% chance to freeze the attacker.
>Regirock
Regolithic repairer: Regains health when hit by rock type moves including sandstorm(1/16th)
This would make these guys actually noteworthy