you can catch munchlax you just have to slather honey on a tree but dont get your hopes up brecause hes very rare
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You can find Leftovers in Victory Road on Pokemon Platinum. Leftovers can sometimes be held by wild Munchlax which can be found after using Honey on the golden trees you see around Sinnoh.
They will run away, and you have to find them in the wild and capture them.
I never saw a wild Stunky in Platinum, but I have in Diamond in the grass under the bicycle road.
You can't catch Cranidos in the wild or from a special event. You'll need to trade for it from Pokemon Diamond, Pearl, or Platinum.
There is if you have the action replay. Use the wild Pokemon modifier code and there is an advanced Pokemon modifier code for Pokemon platinum. If you don't have the action replay then you can't. You have to choose him as starter from Prof. Rowan.