Yes, just north of Sunnyshore.
Route 223 I believe there is one in Victory Road. It's in a double battle with a Rapidash-using Ace Trainer.
Finneon will evolve into Luminneon at level 31.
There is no trainer in platinum that is willing to trade a munchlax.
you can find the trainer with the misdreavus in platinum in hearthome city i believe
Sorry but there isn't a trainer with a bagon in platinum.
no one no trainer has a kingdra in Pokemon platinum exept for me :P
The trainer in victory road
A trainer has it in their party on route 221.
A trainer on iron island has hippotas
A Trainer on route 220
the trainer by that place, you know ? :)
You will see Lumineon at the north exit of Sunyshore city when you see the first double battle with a girl and a boy the girl will have lumineon level 43.