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You cannot buy PP Ups or Elixirs/Ethers in Pokemon Platinum. You can find them around the map, however.
Ethers and Leppa berries will recover PP. They're both hard to find, but if you catch some Clefairy Pokemon they might hold a Leppa berry.
there is one in the old chateau in etrna forest
You can't buy any ethers or elixirs in the game - you get them through random Pokéballs scattered around. You can use a Leppa Berry instead.
You can not get PP ups in Pokemon platinum.