How can I check my Pokemon's Effort Value in SW/SH?
Checking a Pokemon’s EVs is incredibly easy in Pokemon Sword and Shield. All you have to do is check the Pokemon’s summary, navigate to the stats page, and then press the X button. The light yellow represents the current stats of the Pokemon, and the second color represents the Pokemon’s EVs.
Pokemon Sword and Shield – How to Check EVs (AOTF)
Hope I helped!