You can't. If you want a Mothim, you catch a male Burmy, because only the males evolve into Mothim. They don't even go through the Wormadam stage. Females only evolve into Wormadam.
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Wormadam is the highest evolved form of Burmy. You cannot evolve Wormadam.
wormadam
wormadam
you go to route 215
Diamond and Pearl Sinnoh Dex: 46# Wormadam Platinum Sinnoh Dex: 46# Wormadam