You can use Ethers and Elixers. I think Ethers restore one move's PP by 10, and Elixers restore 10 PP for all moves. I'm not real sure, though. I never really use them.
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5 pp
You can use elixirs, max elixers, and leppa berries.
no berries
you can't buy any pp restore items, only find them. If you have a leppa berry, you could plant it and let it grow. Leppa berries give you 10 pp restore.
There is no item called PP restore. The items that restore PP, Ether and Elixir and their upgrades, aren't for sale anywhere, but you can find it all over the ground. The Leppa Berry also restores 10PP. I recommend farming Leppa Berries, as that's the only way to have a limitless supply of PP-restoring items. Also, equipping a Leppa restores 10PP to the move that reaches 0PP first without costing you a turn, which is pretty neat.