Here's how to check your Pokémon's Individual Values (IV)If you want to make sure you have the strongest Pokémon you can possibly get, you'll want to use the IV Checker.
You can't put a value on your Pokémon. . . Well, maybe you can. Anyone who enjoys competitive play or anyone who simply wants to make sure they have strong Pokémon in their party will want to check their Pokémon's Individual Values (IV). This allows you to see how powerful your Pokémon's stats are via a rating. What's more, IVs are different from one Pokémon to the next.
Each of your Pokemon's stats has a range from 0 - 31. The higher the number, the more powerful your Pokémon is in that stat. However, you can only tell what your Pokémon's IV levels are once you've unlocked the IV Checker. Here's how to unlock the IV Checker in Pokémon Sword and Shield.
How to unlock the IV Checker
To unlock the IV Checker, you will first need to beat the main storyline. That means you'll need to have collected all eight ...
Source:
Here's how to check your Pokémon's Individual Values (IV)