 Every defeated Pokémon gives at least one EV to each of the Pokémon that fought it.Certain factors, like holding the Macho Brace item, can increase the rate at which EVs are gained in battle.In "Pokémon Gold" and "Silver", a condition known as was introduced which doubles the rate at which EVs are obtained, and will be contagious for a certain number of days, allowing it to spread to other Pokémon.