For the wealthiest Pokemon Trainers, a simple ground battle is far too mundane for their tastes. Why should they do anything simply, in ordinary circumstances?
One obscenely rich Trainer, a certain Mr. Boddy, followed this train of thought to the logical destination: battling in the most incredible environment possible. The ground was ruled out right away, of course; even the largest, most dynamic stadium lacked the necessary grandeur for Trainers of the highest standing.
Battling at sea seemed appealing; perhaps aboard the most luxurious cruise liner available? But no, that was still too common. After all, ships like the S.S. Anne and the Royal Unova were open to the public of all things.
And in a flash of genius, it came to him. He remembered which Pokemon was supreme in the legends of his native Hoenn. Why, only the domain of Rayquaza would be a fitting battleground!
And so the airship Castelia was born. A massive airship, it would have room for but sixteen passengers besides the crew. The suites would be exquisite, the dining rooms gorgeous. And of course, there would be room for a standard battling arena. No expense would be spared; the Castelia would provide the greatest battling experience in the world.
Only the elite, the best of the best, would travel aboard this marvel--aboard the airship Castelia.