Effort Values, Pokengine Wiki

Effort values, or EVs, are points earned by a Mon through battle, vitamins, or other means. EVs raise a Mon's battle stats. A mon can have a total of 510 EVs, with a maximum of 252 in any one stat. When a Mon has reached the maximum number of EVs, the "EV" at the top of the stats summary page will turn red. Due to effort values, trained Mons are usually stronger than wild Mons, even those of the same level. Defeated Mons give out 1, 2 or 3 effort points to a particular stat, depending on species

Effort Values, Pokengine Wiki

Games - Effort Values

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Guide] EV Training Boosters : r/PokemonUnbound