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I'll start with the Regis:
Regirock:
>gets new ability: Rock Repair which heals 1/16th HP in a Sandstorm + HP is restored if hit by a rock move similarly to volt absorb or water absorb
Regice:
>gets Snow Warning as HA instead of Ice body
Registeel:
>gets new ability: Auto-repair System which heals 1/16th HP per turn regardless of weather, essentially a free leftovers
Regigigas:
>Slow start only lasts for 2 turns instead of 5