You need to find them or buy them at Veilstone City.
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You can not get PP ups in Pokemon platinum.
You cannot buy PP Ups or Elixirs/Ethers in Pokemon Platinum. You can find them around the map, however.
Right, You cannot get an pp max in Pokemon diamond or Pokemon pearl nor platinum!
Nowhere. However, there are feathers that you can find on the Driftveil Drawbridge, which mimic pp ups, hp ups, zinc, carbos, etc.
i think its 5