if your talking about for your mons to do things like surf if you go to one of mons and see it has a "skill" those are the hm moves so you don't need to teach hms to your mons just find one with the "skill" you need
to anyone wanting an actual answer, I've been using, Emmie; from Mystery Gift for; Cut, Surf, Strength, Rock Smash, and Headbutt Harpy; from Blue Oak for Fly and PlayerPred(fem) / Roselia; for Sweet Scent
and I recommend using the Weather Trio after you do Dino dig's story Stuff