Natant

Natant- swimming or floating.

Ash Ketchum, Adrien Agreste, Hiccup Haddock and Branch Hawthorne are four normal teenage boys living in a beachside city called Crescent City, each with their own problems, either at school or at home. But these four fast friends soon have their lives changed forever after one mysterious night on a strange island. Now, whenever they would touch water, they each magically gain a tail.

Reeling from the discovery that they had become mermen, the four of them need to rely on each other more than ever to keep their fishy tails and subsequent powers a secret from everyone. But who could they trust, other than each other? And can four teenage boys still take steps towards their dreams, even with their new developments?

A crossover between "Pokémon", "Miraculous Ladybug", "How to Train Your Dragon", and "Trolls", based off "H2O: Just Add Water" with some elements of "Big Time Rush".