Unlocking the IV Checker in Pokemon Sword and Shield isn’t too involved, but is more straightforward than it was in Pokemon Sun and Moon. Once it’s unlocked, you’ll be able to see your Pokemon’s IVs in the box just by pressing +, like in the screenshot below.
- First, you need to beat the main story of Pokemon Sword and Shield.
- Then, you must get to the Battle Tower, and challenge it.
- You must accrue six victories – your last battle should be against Leon. When you defeat him, your Battle Tower rank will increase to Rank 4, and you will unlock the IV checker, or judge function, for the Pokemon Box!
- Simply open your Pokemon Box and press + to see your Pokemon’s Individual Values from here.
How to Read IV Judge Statements, and Why IVs Matter 
You want your Pokemon to have the best Individual Values because of how they affect its stats. The higher its IVs, the higher its stats. If a Pokemon has the “Best” IV for a stat, that means it can reach the highest potential stat for that species. A Pikachu with a 31 IV for Speed and is EV trained for max speed will have the highest speed any Pikachu can.
So, if your Pikachu has a “Best” value of 31 for its Speed, it will be faster than a Pikachu with a “Pretty Good” value of 20 for its Speed.
Once you unlock the IV Checker, when you press + in your Pokemon Box, you’ll be able to see a judgment of your Pokemon’s stats. Here’s what they mean.
How to Change IVs
Though Individual Values technically can’t be changed, they can be altered by Hyper Training.
In the Battle Tower, speak to the NPC on the far right of the counter. Exchange a Bottle Cap to Hyper Train a Lv. 100 Pokemon in a single stat. This stat will then be considered “Best”.
You can also use a Gold Bottle Cap to Hyper Train all of a Pokemon’s stats, so they all work as “Best”.
See How to Get Bottle Caps and Gold Bottle Caps in Pokemon Sword and Shield for more information on Bottle Caps.
We say it “technically” can’t be changed because even after a Pokemon is Hyper Trained, it won’t pass on these IVs when Breeding.