Stunky is usually around Route 206 (right outside of Eterna City) underneath the bicycle path/bridge in Pokemon Diamond/Pearl/Platinum. Just walk around in the tall grass and you'll find one.
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I never saw a wild Stunky in Platinum, but I have in Diamond in the grass under the bicycle road.
u can catch it in route 406
Stunky evolves into Stunktank at level 34.It evolves at lvl 34 into Skuntank.
The Darkrai event allows access to Fullmoon Island to catch him in a dream. but if you missed that (like ME) you can catch a Stunky under the Cycling Road. And Train it up to be a Skuntank like the Galactic Commander Jupiter.
At lv. 34.