You can find some on the floor in the Victory Road. Hope I helped :)
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you cant u have to find them
u can buy them in the battle frontier exchange corner for 1bp or find them in artistic cave.
There is no place to buy elixirs in Pokemon Sapphire. You can find them using the item finder.
There is no place to buy elixers in Pokemon Sapphire. You can, however, use your Itemfinder to search them out randomly.
You cannot buy PP Ups or Elixirs/Ethers in Pokemon Platinum. You can find them around the map, however.