It should be the first Elite Four guy he has one
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you can find the trainer with the misdreavus in platinum in hearthome city i believe
Where do you find a trainer who has a glacion in pokemon platnum?
Ace Trainer Garrett on Route 216.
You can find a dustox in eterna forest and there is also a trainer with dustox there too.
the trainer that has bagon in platinum is at the cave where u find heatran the old man near the entrance to heatran has it