Yes, in the water near Stark Mountin and also just use a good rod near Valley WindowWorks.
You can also see one from trainer Swimmer Miranda at a level 43 female on the way to the Pokemon league(she is the first girl in the water you run into)
Edit by Hannd: A fisherman (the 3rd by the left) in Route 222 also has it. He also has Feebas.
You can find a Finneon at stark Mt. To find a trainer with a Lumineon go to Sunyshore city, and the first trainer you see will have a lumineon at Lv. 38 or so.the 2nd and 3rd fishermen on route 222 have finneon
on route 223
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.
the only way is to battle a trainer with it and then u have to checl ur pokedex for that Pokemon the trainer who has a finneon are the fisherman near sunnyshore city's entrance Hope this helps :)_
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.
Exit to the left of Sunyshore city that leads you to route 222 and the third fishermen has a finneon in his party.
Route 222 or 224.
In Pokemon diamond, Pearl and Platinum you can see the evolved form of Finneon, Lumineon, on Route 223 in a trainer battle. The trainer who has a Lumineon is called Miranda. In Pokemon Platinum the trainer Cassandra also has a Lumineon.
do lots of trainer battles but make sure your Finneon is first in your party. do lots of trainer battles and as soon as you battle them switch to a tougher Pokemon and make it beat the trainers Pokemon your Finneon and tougher Pokemon will both get lots of exp which will level it up quicker and evolve it quicker it'll help if your tougher Pokemon and Finneon is holding an exp share hope this helped!
There are some fishermen on the edge of the route that leads to sunnyshore. The second one closest to where you entered the route has finneon. He has 4 Pokemon magikarp, finneon, remoraid, and gyradose. all near level 40
You can't catch it but you can see it. A trainer south of victory road has it.
The Pokemon are Finneon and lumineon. Here is how to see them/catch them. Finneon: You can catch a finneon easily with a good rod in the water at the valley windworks. Lumineon:There is a female trainer in the water on the way to victory road that has a Lumineon if you battle her! ************************************************************************* Hope this helped...