>>29522740Rock = stones
Ground = manipulating the earth
Just about every Ground-type falls under at least one of the following
>digsDiglett, Sandshrew, Excadrill, Onix, Geodude, Nincada, Larvitar
>has some kind of horn or something to drill/pin the groundNidoqueen, Nidoking, Rhyhorn, Gligar
>rolls around, presumably making dirt and such go flyingSandshrew, Donphan, Golem
>made of or covered with sand/dirt/mud/claySandygast, Claydol, Wormadam-S, Mudsdale, Torterra, Golurk
>lives in mudAll the Water/Ground types
>is heavy and makes the ground trembleGroudon, Mudsdale, Torterra, Rhydon line, Golurk
>earth elementalGroudon, Landorus
Presumably sand/dirt/mud/clay falls under Ground and not Rock because it is malleable and not rock solid.