You can only but them at the big PokeMart building in Velistone City. Or use an Action Replay DS.
Correction: You can't buy them, you can only find them in the game, win the PP Ups in the lottery at the Jubilife TV station in Jubilife City by getting 2 of the correct digits, or getting them in a trade from a player who makes their Pokemon hold that item.
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buy them in veilstone city "mall" place.or find them in poke balls on the ground.
You can't. You can only find a PP Up
You Can't
You cannot buy PP Ups or Elixirs/Ethers in Pokemon Platinum. You can find them around the map, however.
You cannot buy a PP up in Pokemon crystal! You need to search for it in caves and other areas you might think it's in! Buy the guide booklet to know where items, Pokemon, and get to know gym leaders or pokedex!