Where is a trainer who has lumineon in Pokemon platinum?

Answer 1

route 205, 218, 219, 220, 221, use a super rod sometimes he will come up rare though or the trainor is on route 218 she is a swimmer also one tranior there has finnieon too

there is a trainer in the water when ur in sunnyshore city go to the water which leads to the Pokemon league and she will be the first trainer u c just go forward

hope this helps :)

the bottom sentence is correct i used it and it works