In Platinum, you can get leftovers in Victory Road, in the place that opens up after you obtain the national pokedex.
1. Obtain the national pokedex
2. Go into the new section of Victory Road that has opened up
3. Once you enter the new part of the cave, go to your right, surf across the lake, and there should be a pokeball on a little piece of land that contains the leftovers
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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.
You can find Leftovers in Route 12. You will need the move Cut to be able to reach it.
you could get leftovers by beating or catching one of the two snorlaxes and use the item finder and there should be leftovers there
You can find the Leftovers item on the S.S. Tidal. It's hidden in a garbage bin somewhere on the ship.
They're in a trash can on the S.S. Tidal.