how many pokemon diamond & pearl players are girls?

gender has nothing to do with it. I've won all battles with almost all girl pokemon. AND i'm a girl who plays a girl so dont worry. the boys kinda suck a lil bit. well, lemme tell u what i do: when i first get a pokemon, i train to level 10 or 15 to be on top before i get to my first battle with a trainer. wild pokemon get u there good but when u get to 10 they slow down a bit. what im saying is that u shud maybe go into the grass and find some wild pokemon to battle and try to get to level 30 on your favorite (not favorite, your best; a really good pokemon you can beat almost any trainer with) or on all the others. then you should at least get some new moves (or buy some new ones or find new ones) you should win without any problem...almost.

Well I'm a girl IRL but playing as a boy in game... I'm not sure what your question means :/ But if you're battling Lucario, try using a Flying-type.

almost the same as boys.use fire pokemon.