Finneon is a small fishlike Pokémon with an ellipsoid body. The bottom half of its body is light-blue while the top half is black. A purple stripe runs across Finneon's horizontal length. This stripe can store sunlight, which allows Finneon to shine vividly at night. It has small blue pectoral fins, two black oval-shaped dorsal fins, and purple eyes. Finneon's most notable feature is the pair of caudal fins that resemble a pair of blue butterfly wings with purple spots. Because of its wing-like fins, it is known as "The Beautifly of the Sea". The bottom lobes of a female Finneon's tail fin are bigger than a male's. It lives in bodies of water, and it travels in schools, sometimes with Lumineon. Wingull is a natural predator of Finneon.
In Staging a Heroes' Welcome!, Zoey used a Finneon during the Performance Stage of the Wallace Cup. Finneon was revealed to have evolved into Lumineon by Last Call — First Round!.
Finneon debuted in The Rise of Darkrai.
A Finneon appeared in Giratina and the Sky Warrior.
In Hold the Phione!, multiple Finneon were living at Chocovine Town.
In Strategy Begins at Home!, Team Rocket was fishing for Goldeen in a lake where a Finneon lived.
In Going for the Gold!, multiple Finneon were living in the Ambrette Aquarium.
Multiple Finneon appeared in Alola to New Adventure!.
Multiple Finneon appeared in The Guardian's Challenge!.
Four Finneon appeared in Yo, Ho, Ho! Go, Popplio!, with one being wild and the other three appearing in a fantasy. Lana gave the wild one some food after capturing it by fishing. It was later captured by Team Rocket.
Multiple Finneon appeared in The Island Whisperer!.
Multiple Finneon appeared in Balloons, Brionne, and Belligerence!.
In Dewpider Ascending!, a Finneon checked out a Dewpider soon after it entered the ocean before swimming off.
In Don't Ignore the Small Stufful!, a Finneon was staying at Aether Paradise.
A Finneon appeared in Keeping Your Eyes on the Ball!.
Multiple Finneon appeared in Pikachu's Exciting Adventure!.
In The Sinnoh Iceberg Race!, a Trainer's Finneon competed in the Pokémon Iceberg Race.
Three Finneon appeared in Getting More Than You Battled For!.
||Finneon, the Wingfish Pokémon. Because of its twin-tail fins that flutter like wings when swimming, Finneon has been called "The Beautifly of the Sea."