Beginner's Guide to EV Training - Nugget Bridge.
What are IVs? IV is an abbreviation for Individual Value, a hidden value which is combined with a Pokemon's Base Stats and EVs to calculate the Stats which are visible to players and used in battle. Unlike EVs, IVs are determined randomly for each Pokemon, and are generally uncontrollable by the player. IVs are valued at 0 to 31 for each stat, where 0 is the worst number and 31 is the best.
Power Items: When held by the Pokemon you are EV training, it increases the amount of EVs you get 4 or 8 if you have Pokerus. There are 6 power items 1 for each of the 6 stats. They will give you EVs for its specific stat. Power items will also halve your speed of the Pokemon holding it.
Super Training is a new mini-game you can play to increase your EVs. The main training has you shoot soccer balls into a goal tended by a Pokemon-shaped balloon, while avoiding balls hitting your own goal. You start with level 1 training. A successful level 1 game will grant your Pokemon an instant 4 EVs in the stat you were training. Once you've completed all six level 1 training sessions.
EVs (Effort Values): Effort values are used to increase a stat. While IVs increase the growth rate, EVs actively add to that stat. You are given a total of 510 effort values to distribute as you please. There are multiple ways to gain EVs as we’ll explain below, however all you’ll need to know for now is that a single stat can have an EV of 252, so in theory you can split this so two stats.
Effort Values (EVs) are one of the building blocks that define the power and focus of your Pokemon. Every time you defeat a critter, your Pokemon will get an EV point in one specific stat - either HP, attack, defence, special attack, special defence, or speed. Beat an Electrike, for example, and you'll get a EV point for speed. Collect four speed EV points and you'll boost your speed stat by.
Which Items Raise EVs in Pokemon Sword and Shield. Competitive Pokemon can get surprisingly deep, and one of the deepest element of competitive battling lies with raising a Pokemon's EVs.
PokeRus. For more information on this, please see the Pokerus Guide. Like Macho Brace, Pokerus doubles the EVs gained. So if a Flygon has both Macho Brace and Pokerus, it would gain 4 Speed EVs from defeating a Pidgey, and not just 2 or 1. Note that Pokerus can be lost, but your Pokemon still gains double the EVs after losing it.