I had to read in on that too. its EV's/ EV. It's when you train your pokemon against wild pokemon and you keep battleing against the same one till you level up. It gives your pokemon more points in Hp, speed, atk,def,special atk/def. For example: If you battle only gyarados till you level up, your guys attack goes up more than usual (2 pts). Graveler would give def(2 pts). ther are lots of different pokemon that give good EV's but the ones that are good in the wild only give max 2 pts. ones that give 3 pts are evolved formes of ones that give 2 pts, which you can't find in the wild. I think there is a page on EV's on that serebii.net site (i don't know if i spelt it right). thats how I found out ^^.