Tuning your Pokédex in Pokémon Brilliant Diamond and Brilliant Pearl means you'll need to search for Pokémon in all types of terrain, including water. Finneon is one of these Pokémon that reside in water; in fact, it can only be caught by fishing. However, you will have to wait until you have a couple of Gym Medals before you can get it. Here's what you need to catch Finneon in Pokémon Brilliant Diamond and Brilliant Pearl, as well as where you can find the Wing Fish Pokémon.
Before you can catch Finneon, you'll need to acquire the Good Rod, which you can get from a fisherman NPC on Route 209 near Hearthome City. You can now find Finneon in various bodies of water around the Sinnoh region by fishing. We found Finneon while fishing on Route 205, but you can find Pokémon by fishing in one of the following locations:
- Path 205
- Path 218
- Path 219
- Path 220
- Path 221
- Wind power plant in the valley
- City channels
- Iron Island
Once Finneon is captured, acquiring his evolved form, Lumineon, is a fairly easy task. The Pokémon evolves at level 31, which it should reach easily as long as you keep it in your party as you progress through the game. Alternatively, you can also catch Lumineon by fishing in the same areas as Finneon resides; just use the Super Rod instead of the Good Rod.