It's likely to be a Legendary Pokémon, the closest this world has to gods. Which one specifically, however, is a question no one can answer at the moment. Perhaps they'll show themselves later, and are awaiting the opportunity to make an impressive entrance.

[It wouldn't surprise him at all, considering the personalities of the Legendaries he's met before. He gestures at their surroundings.]

We know they are a creature of excellent taste, at the very least.