its the same thing as diamond you put honey on the scented tree and there will be a 5% of a female burmy and if you get one level it up [if itsplant cloak level up in forest if its trash cloak level up at iron island if it ground cloak level up at resort areas desert]
on route 214
In order to get a wormadam in Pokemon Platinum, you need to catch a female Burmy and evolve it.
wormadam.
wormadam
Wormadam does not evolve.
You ca't see it! Put some honey on a tree and catch a burmy then evolve burmy
wormadam
Wormadam
On route 214 between Pastoria and Veilstone a beauty has a wormadam.
Route 214
you go to route 215
The trainer who uses a Wormadam in "Pokémon Platinum" is named Devon who is within Route 214.