Wavecrest

The Wavecrest (ウェイブクレスト) is a Heartless Boss from Kingdom Hearts 358/2 Days. It's in the same family of Heartless as the Wyvern.

Kingdom Hearts 358/2 Days
These large aerial Heartless use their potent water breath to attack their prey.

This strain cannot be forced to land, so be sure to face them well-equipped to do combat in midair.