From Bulbapedia:
"Finneon is a small fish 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."
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finneon evolves into lumineon
You can get Finneon throughout Canalave City and around Floaroma Town. ( The best way to do that is to use a good rod.)
I don't think there is a Trainer with a Finneon, but there is a trainer with a Lumineon somewhere. You can find a Finneon on Route 205 South, Route 218, Route 219, Route 220, Route 221, Canalave City, the Valley Windworks, and the Fuego Ironworks. You can also find a Finneon in Iron Island if you fish with the Good Rod.
no
Exit to the left of Sunyshore city that leads you to route 222 and the third fishermen has a finneon in his party.