First of all, Lycanroc isn't a Ground type (don't know if you meant it that way). And secondly, those two are really the only fast non-legendary, non-mega Ground or Rock type. Aerodactyl is a beast in Speed, but Grass Knot is neautral so you may as well use Plasma Fists (or whatever Electric type move you have). This is the same case with Flygon, Garchomp, and Archeops (I'm sure there's more). Except don't use Electric type moves on the first two.