This is a symptom of the how needed a type shake up is, where certain types are too broad or too narrow. Like how Bug-Type, which otherwise includes all arthropods. somehow excludes crustaceans. Water-Type conversely should be split up into something like Fish, Made of or manipulate Water, and Aquatic reptiles/amphibians/mammals/etc. Flying-Type needs to be split into Bird and Wind (and practically already is). Finally Ground is heinous for how nonsensical and overly broad it is. It either means "Earth" in which case Rock already covers it and indeed many of these are part Rock anyway. "Particulate" like sand or mud, "Vibrations and Sound", "Digs holes and Tunnels", or "Is big and stompy". Every Ground-Type Pokemon can, would, and should easily be slotted into another type.
