15. Primal Groudon has effectively only 1 weakness ground.Since it has extremely high physical defense and most ground types are physical it is built to tank that. Fire negates the weakness to ice and grass that weakness of a ground type making it just neutral damage, and ground takes away the fire's weakness to rock. Would normally have a 4× water weakness to water, but not with desolate land up, it becomes an immunity. Plus Primal Groudon just looks cool as heck with the molten lava glowing all over it's body!