[ Well, it's time for Mizuchi to show herself. Kaiba stands and moves back toward the ocean, wading in next to an enormous blue seahorse, about the same height as him. ]

This is Mizuchi, she's a Kingdra. I know she looks like a seahorse, but she's a dragon.

[ She makes a soft snort. He pets her snout and continues. ]

The Pokédex states that Kingdra and Dragonite are permanent rivals and always fight over territory---and Dragonite is what your little dragon is going to evolve into. Mizuchi will definitely want to battle yours when they're grown and ready.