Wasn't it replaced with
Ectoplasm Manipulation?
Inorganic Physiology is good, they (Regieleki is included) also should have Immortality type 1 like other regis.
Regidrago also is lacking some abilities from moves it already has and they are uncontroversial:
Damage Boost (Via Dragon's Maw),
Natural Weaponry (Via various bite moves),
Status effects (Paralysis [Dragon Breath, Body Slam and Thunder Fang], burn [Fire Fang] and Flinch (Snore)),
Statistics Reduction (Via Crunch),
Healing (Via Rest),
Sound Manipulation (Via Snore).
Also, this would be added to the possible abilities, as Mold Breaker is considered like this on the wiki:
Power Nullification and Resistance Negation (Mold Breaker negates abilities and effects that would reduce the damage taken, reflect status effects, grant resistances and prevent Regidrago's attacks from causing damage)