Finneon

Diamond +2: After long exposure to sunlight, the patterns on its tail fins shine vividly when darkness arrives.

Pearl: The way its two tail fins flutter while it swims has earned it the nickname “BEAUTIFLY of the Sea.”

Platinum +6: The line running down its side can store sunlight. It shines vividly at night.

HeartGold / SoulSilver: Swimming and fluttering its two tail fins, it looks like a BEAUTIFLY. At night, the patterns on its tail fins softly shine.

Sun: It absorbs sunlight with the pink areas of its skin, which then shine. This appears to be a form of camouflage.

Moon: Its double tail fins propel its energetic jumps. When it breaks the surface of the sea, Wingull swoop down to grab it on the fly.

Ultra Sun: When night falls, their pink patterns begin to shine. They’re popular with divers, so there are resorts that feed them to keep them close.

Ultra Moon: It lures in prey with its shining tail fins. It stays near the surface during the day and moves to the depths when night falls.

Legends: Arceus: What a gorgeous sight this Pokémon is as it swims with its long, pink-painted caudal fins fluttering behind it. Finneon's beautiful appearance has led to its nickname: ”finery fish.”