No one you have to migrate or do it through pal park!
Yes
no one no trainer has a kingdra in Pokemon platinum exept for me :P
No trainers have it. But, you can find it in the wild.
There is no trainer in platinum that is willing to trade a munchlax.
Sorry but there isn't a trainer with a bagon in platinum.
you can find the trainer with the misdreavus in platinum in hearthome city i believe
The trainer in victory road
A trainer on iron island has hippotas
A Trainer on route 220
A trainer has it in their party on route 221.
the trainer by that place, you know ? :)
There is no trainer with Lickylicky in Platinum. You can however catch one at the lake near Twinleaf. You will need Surf.
there is a trainer on the route 114 who has a vaporeon