Translations:EV training/1/en
From Pixelmon Wiki
Like the main series Pokémon games, Pixelmon incorporates a system allowing a Pokémon to grow in strength based on the opponents it defeats. This is done with hidden values known as Effort Values (EVs) that exist for each of the six stat values. This system works identically to the one found in the Pokémon games, and so an understanding of the mechanics found there should allow you to EV train successfully within the Pixelmon mod.