'EV' Stands for effort value. There's a good guide here: http://www.psypokes.com/lab/evguide.php
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It means the Pokemon was trained in certain stats. Battling Pokemon gives you a certain amount of EV points. For example, battling a starly gives you 1 speed EV point for the Pokemon that battled it. Different Pokemon give different EV's. EV's work like the following: every 4 EV's you get in one stat, that stat is raised by 1. The maximum EV's you can have in any one stat is 255 and the total number of EV's your Pokemon can have is 510. So essentially, only two stats can be fully maxed. You could also divide up the EV's evenly into the stats, but that's not the best thing to do. EV-training is tedious, and without the right items, it takes forever. Go to serebii.net for all the info about EV's.
depends on the nature the Pokemon haves:P:P
Train it as you train all pokemon.
No
it is impostible