Effort values, or EVs, as they are most popularly called, represent how hard you personally work trying to train your Pokemon. They improve your Pokemon's statistics by a small percentage, depending on how much you work yourself. If your Pokemon gains a level by competing in battles, it will gain more EVs than it will if you use a rare candy or if you put it in the day care.
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'EV' Stands for effort value. There's a good guide here: http://www.psypokes.com/lab/evguide.php
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Effort Value is an internal stat list inside the Pokemon besides the obvious stats. Depending on how your EVs are, it will affect the amount of points whatever stat is being 'EV Trained' gets. Say that you EV train a Pokemon's Sp. attack, when he levels, he'll get more than just 0, 1, or 2 points. Sometimes as good as 7, depending on how well you were doing it.
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