If your Pokemon happens to run out of PP, then I would use an elixir on that Pokemon if I were you. If you try attacking while you have no PP left, then the Pokemon will use a move Struggle. Struggle is a not so good move that hurts both the opponent and the user.
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Elixir restores the PP of a Pokemon's move. There are two types of Elixir: Elixir, and Max Elixir, which restores the PP of all of a Pokemon's moves.
it fully restores the pp of either all or one of your pokemons moves i forget
If its power points (PP) runs out on all its water moves, then yes. Blastoise can run out of water.
Elixer and Max Elixer both refill pp, normal elixer recovers 5pp while max recovers the max pp. The item pp-up will increase any moves pp by 20% of its max pp.
You can buy the Avalanche TM at the department store in Goldenrod city. it has 10 pp