Effort Values, colloquially abbreviated as EVs, are statistical determinants that are calculated into the eventual upgrowth of your Pokémon's stats. They are the teal-colored stats shown in your Pokémon's stats on their hover-over card in-game.
They are also the only stat factors that players have fine-grained control over; while Natures and IVs are mostly hereditarily predetermined and inalterable, EVs start off completely unfixed and are determined by the player through the EV points accumulated during training. They are also retroactively trainable because akin to the Generation V-and-onwards system of EV-training, EVs are recalculated on an after-battle basis, not a level-up one; this allows you to reapportion your Pokémon's EVs by using EV-reductive items in conjunction with retraining them.
Because of the magnitudinous difference EVs can make in your Pokémon's eventual stats and the time and expenses needed to procure EV-reductive items, it is advised to be conscious about what Pokémon you train early on if you wish to be meticulous about your Pokémon's EV apportionments, as different Pokémon dole out varying EV quantities for varying stats; read below for more information.
Calculating Effort Values
The total amount of statistical points produced by EVs is illustrated below in formulaic notation:
In other words, 4 EV points gained for a stat will extrapolate to one additional stat point at later levels.
The maximal amount of EVs obtainable for a singular stat is 252—the highest 4-divisible amount of EVs that could be gained in the official games and consequently the rigid limit in PRO—but the cumulative limit is 510; in other words, while a single stat, such as HP, can only be attributed with up to 252 IVs, other stats can be trained up to that limit until all stat-respective EVs additively combine to 510. Calculatively speaking, up to 63 stat points can be accumulated for any singular stat, whereas up to 127 points can be attained in your Pokémon's statistical totality.
Accumulating Effort Value points
Effort values are accumulated predominant through training on wild Pokémon. They also are yielded by NPC-deployed Pokémon; the only exceptions are those that have no experience-points and monetary payouts, such as gym-leaders for secondary battles and onwards.
- Main article: List of Pokémon by EV yield
Due to how many EV points are naturally derived from Pokémon-training, it is judicious to be conscious about what stat-respective EVs are yielded by the Pokémon that you train on.
All Pokémon yield an amount of EVs ranging from 1-3, depending on its evolutionary stage. The total amount of EV points yielded is incrementally respective to the evolutionary stage of the Pokémon; for example, a base-stage Pokémon in Pidgey yields 1 point total, its intermediate-stage evolution in Pidgeotto rewards points total, and its final-stage form in Pidgeot yields 3 points total. All unevolvable base-stage Pokémon will also yield only 1 EV point total; the only exceptions are the elusive Legendary Pokémon, who invariably yield 3 total EV points.
The stat-respective EVs rewarded will oftentimes tally to the most vital stat of that Pokémon; for example, Machop's evolutionary line yields Attack EVs due to the predominance of Physical-powered damage-dealing techniques that it learns, whereas Abra's evolutionary line yields Special Attack EVs due to the predominance of Special-powered moves that they deploy.
The putatively finest-grained area for EV-training is the Safari Effort Wald—an augmentation of the Kanto Safari Zone wherein Pokémon spawns are compartmentalized into different areas based on their EV yield.
While it does charge a 10,000 entry fee and restricts you to a 20-minute session, it does provide the most unadulterated zones for EV-training in the game and EV-enhancing supplements for auxiliary EV-gaining.
The Macho Brace can also be employed to quicken the EV-training accruals. While equipping this item, the toting Pokémon will receive double the EV payout; however, the one drawback is that its Speed will be halved in-battle.
- Main article: Vitamins
While it may demand a hefty outlay, EV-enhancing vitamins are a more expeditious avenue towards reaching your desired EV apportionment.
All of these supplements are single-use and will instantly add 10 EV points to your Pokémon's stat, in addition to enhancing its happiness points. They will only enhance the Pokémon's EVs until 100 have been accumulated for them, stat-respectively.
The following supplements are available:
|HP Up||Enhances the consumptive Pokémon's HP EV points.|
|Protein||Enhances the consumptive Pokémon's Attack EV points.|
|Iron||Enhances the consumptive Pokémon's Defense EV points.|
|Calcium||Enhances the consumptive Pokémon's Special Attack EV points.|
|Zinc||Enhances the consumptive Pokémon's Special Defense EV points.|
|Carbos||Enhances the consumptive Pokémon's Speed EV points.|
All these supplements are buyable in all of the Department Stores, and many are found interspersed as ground-lootable items around maps.
- Main article: EV-reductive berries
If you wish to reassess or revamp your Pokémon's EV spread, the first step is to purge the EV points; you can do so with EV-reductive berries.
The intake of each berry will enhance the consuming Pokémon's happiness while depleting its EVs by 10 points. The following stat-respective berries are available:
They can be looted from any Headbutt-able tree, rewarded for completion of the Berry Tower challenge, bought in the Goldenrod City Flower Shop after defeating The Pumpkin King in Vermilion City Graveyard, and harvested through a smattering of berry-tree allotments.