Chatot :O
It's the sun! It's a sun stone! No, it's...<insert Pokémon here>!
Urm, Sunflora?
And I think the answer to the question is Loudred, not Chatot.
Well, all three of those Pokémon make loud noises...anyways, the sun stone one was what ruled out Sunflora and made the answer Solrock
Anyways, I'm not going to be rude and say "Cloyster" here - Shelgon!
This Pokémon gains mysterious powers when exposed to the moon's glow B)