Good job, Face! It is indeed Volcarona!
Hmm... wha? The riddle? That was today? Aw, man. I'm late. Alright, let's do it.
So, my name is- wait, what? What do you mean this is going to humans?!
Seriously, dude? I hate humans! Ugh, despicable little creatures.
They make you feel all special about yourself, and then suddenly, they go and abandon you for centuries, all alone! Volcarona was inferred to be worshipped in ancient times, but the only one available is alone in a room in the Relic Castle.
What do you mean, I'm prejudiced? The only one who's seen me in years made off with my children! A Ranger gives you a Larvesta egg that they found in the Relic Castle.
Not like my remaining ones are much use... They're almost as old as me, and still immature as ever. Larvesta doesn't evolve until level 59.
Don't even get me started on their music tastes. I hate rock. Give me a nice bamboo flute any day. Quad weakness to Rock, quad resistance to Grass.
Wait, you're done? Fine, fine, whatever. Just leave me alone. Man, I already gave my guards lasers, what else do they need? The Claydol found in the room in BW all know Hyper Beam.
And the hint-
What, you again? What do you want?
A hint? Yeesh. These humans really are stupid, aren't they?
Fine, fine. Uh... how to put this so it doesn't sound cheesy...
You'll find me where my powers are strongest,
But I am unable to reach them. Volcarona is available in the desert- where the sun shines strongest- but is hidden away from the sun, in its underground room.
Is that okay? Yes? Good. Get out. Gotta reseal that entrance... Meh, I'll do it tomorrow. The entrance to its room is opened after entering the Hall of Fame.
Great job, Face!