>>30564780Pokemon you want to train needs to be level 100. After that, you take it to Hau'oli Mall and go to the first shop to the right of Battle Buffet, where you trade a bottle cap(regular cap for one stat, gold cap for all stats.) to have a stat raised. It should be noted that it doesn't ACTUALLY effect IVs, just the stat. So if you have a 'mon with a 20 attack IV, it'll raise its Attack to be equal to a 31, but it won't change your hidden power type, and while breeding you'll pass down the 20 attack IV.
