Psycho Cut
Well-Known Member
^I don't even understand all that EV and IV stuff
http://www.serebiiforums.com/showthread.php?t=499840
^^ This is a link to a thread which explains EVs, IVs and natures very well. If you do not understand this stuff, and therefore do not take an advantage of it, then you'll be at a big disadvantage to other players who do. This'll cause you to lose games, no matter your tactical prowess.
Also, there are fantastic guides on this kind of stuff on the actual serebii site, and other pokemon sites.
I strongly advice you to get to grips with EVs, IVs and Natures before entering the harsh, wide world of the competetive metagame.