I think one needs to be put in place because of Last Resort.
What do you mean? There already is a PP system. All moves have the normal amount of PP, it's just that it usually doesn't matter, so you don't hear about it much.
I thought that the in the Battle part of the URPG, PP acts exactly the same as it does in the game.
I know that in the National Park a move's PP is only used to measure how difficult the move is for the Pokemon to pull off... is this what you are referring to?
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Eh what? Last resort is only usable after all other move's PP is used up.
This 'counter' resets if the user switches out, faints, or the battle ends. Last Resort will fail if it is the only move the user knows.
-per Bulbapedia's page on the move.
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I would like to mention that, in the championship battle between Mike and I, the PP usage was a pivotal part of the outcome. Point being, it IS important to count the PP usage of moves, specially those with low PP count.