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.
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There is fisherman who has finneon on route 222 3rd fisherman and he also has feebas
Route 222 or 224.
It is finneon!
Level 30.
When you surf up to Sunny shore city, there will be fishermen trainers. The first trainer you see will have a Lumineon at level 38, the evolved form of Finneon.
Canalave City use good rod.