Low-Godly Regenerationn for Danny Phantom ghosts is combat applicable. It is explained in the notable attacks / techniques section but I'll explain.
To go into quick detail. Ghosts in Danny Phantom have "cores" which are small orbs. These cores are made up of a ghosts unique ectoplasmic energy and their consciousness, and are
Non-Corporeal. The ghosts then manifest "bodies" which is what you see them as most of the time. These bodies non-corporeal as well (as shown many times) but in order for ghosts to interact with the real world they need to make themselves tangible.
They can regenerate their physical form in seconds if they want but it's not passive, ghosts half to manually activate their Regenerationn. Their core however takes minutes to regenerate if shattered. So yes, Danny's Low-Godly Regenerationn is usesable in combat.
His Body has (Low-Godly), His Core has (High-Mid).
His resistances are explained on his resistance tab (not the exact numbers). But I'll explain them quickly.
Possession, Mind Manipulation, and Soul Manipulation: He hard resists Possession on a biological (molecular level), mental and spiritual level. He no sells Mind Control that effects 5,000 people at the lowest and he can tank attacks that effect the mind. He resists attacks that effect the soul.
So he has decent mind hax resistance but if you have anything at city level or above he is screwed since City level resistance is his High Balled cap. His soul resistance isn't that great, if you have anything a bit above the average soul attacking he's screwed.