Effort Values (EVs) are hidden stats that boost a Pokémon's abilities. Every time a Pokémon defeats another Pokémon, it gains EVs in specific stats. For example, defeating a Geodude gives Defense EVs. While not strictly necessary for the main story, EV training can significantly enhance your Pokémon's performance, especially for competitive play. Focus on maximizing two key stats for each Pokémon, such as Attack and Speed for an offensive sweeper. Vitamins can also provide EV boosts.
