theres this move called trump card and i dont have a pokemon to test it with and i dont really follow wat it says in the instruction so i dont really understand wat it does :)
this link explains it all http://bulbapedia.bulbagarden.net/wiki/Trump_Card_(move)
The fewer PP this move has, the greater its attack power.
4+PP = 40 Base Damage
3PP = 50 BD
2PP = 60 BD
1PP = 80 BD
Last PP = 200 BD
Click for more info!: http://pokemondb.net/move/trump-card#move-descr
Hope this helps!