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Effort values (also known as EVs) are values that improve the stats of Pokémon based on the strengths of opposing Pokémon they have defeated.
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Stat effects
Pokémon can gain six different types of EVs, one of each of the six stats (HP, Attack, Defense, Special Attack, Special Defense, Speed), and each individual Pokémon can gain a maximum of 510 EVs, with an additional limit of 255 EVs per stat. By gaining EVs in a certain stat, that stat will gradually rise, with a final ratio of 4 EVs equalling 1 stat point at level 100 (rounded down). A Pokémon can have a maximum of 63 extra stat points in a certain stat, and a total maximum of 127 stat points across all stats due to the effects of EVs. The 4:1 ratio means that having 255 EVs in a stat is redundant, as the same effects would be achieved with 252 EVs.
The effects of EVs are applied immediately, and leveling up is not necessary to see their effects. At lower levels, it will take more EVs to equal 1 stat point (e.g. 8 EVs per stat point at level 50), but as levels are gained, the contribution of the existing EVs to stats will eventually reach the 4:1 ratio at level 100.
Gaining EVs
After defeating a Pokémon, either a wild Pokémon or a trainer's Pokémon, every non-fainted Pokémon that participates in the fight or is holding an Exp. Share will receive a specified amount of EVs, depending on the species of the Pokémon that was defeated. Every eligible Pokémon gains the full amount of EVs that are yielded by the defeated Pokémon.
EVs cannot be removed after obtaining them.
Items
Certain held items allow the holder to gain additional EVs whenever a Pokémon is defeated. However, Pokémon will have their Speed temporarily halved while holding these items.
- A Pokémon holding a Macho Brace will gain double the normal EVs from any encounters.
- When a Pokémon holding a power item gains EVs, the holder will receive 4 additional EVs in a certain stat, depending on which power item is held:
- Power Weight-HP
- Power Bracer-Attack
- Power Belt-Defense
- Power Lens-Special Attack
- Power Band-Special Defense
- Power Anklet-Speed
