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.
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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.
I don't think you can buy Ethers. But you can farm berries. I'm not sure if they're in FR/LG.
You can not buy ethers from the PokeMart, but you can find them lying on the floor in certain routes. If you have a Pokemon that knows the move Cut, go to the top left corner of the Eterna Forest where you can find the Old Chateau. There is an Ether there if you have not already got it. There are about three more, but I can not remember where they are. Hope you find them! Good luck! And you can get 999 of them from ar cheats for more of advise they are 20$ at walmart. They can get you 999 ethers. Thank You!!