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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'EV' Stands for effort value. There's a good guide here: http://www.psypokes.com/lab/evguide.php
Max out your Pokemon's EVs.
== To get the effort ribbon is simple. All you need to do is max out your Pokemon's effort values(EVs), this can be done by fighting a lot of Pokemon or done more quickly using different items and with Pokerus.
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.
yes a Pokemon with pokerus gains double effort vallue points when it defeats a Pokemon