User blog comment:ChaosKnight/Let the tourney begin!!!/@comment-3290324-20130530205653/@comment-5840892-20130531173231

I can answer that. EV Training is the art of raising a Pokemon's base stats by raising their Effort Values (EVs). This can be done by battling certain wild Pokemon and accumulating the Ev's for defeating them. (For example; Audino gives HP EVs) For every so many you earn; your Pokemon's base stat will go up (usually upon Leveling up). A good example of this is in the Giant Chasm of Black and White (first games of Gen V only) you can take a Lv 100 Pokemon in there (such as Arceus) and defeat a bunch of wild Pokemon; and after so many battles it's HP will start increasing. (I got mine from a base HP of 390 to a base HP of 404, although I'm not sure if it's supposed to work that way, or if it was a glitch in the game.)

Another more classic way to EV Train is through the Nutrient Drinks that you can buy and give to Pokemon. (Protein, Zinc, Carbos, Iron, ect.) You can also take then to the Gym or Resturant in Join Avenue in Black 2 or White 2 and pay to have then raise a base stat or level. Also; remember that a Pokemon's Nature and Personality can affect it's stats. For a better/clearer and detailed explanation; check here: http://www.serebii.net/games/evs.shtml