>>32756532Primal kyogre should be water/electric, to gain STAB on thunder (a storm-related move, perfect for it), and be a complete opposite to p-groudon's ground/fire.
Primordial sea should negate fire attacks as well as ground attacks (there's no earth to quake if every time you try all the ground is washed away by endless water). Desolate land should negate water attacks as well as electric attacks (to my understandment, super-heated ground and sand are a bad electric conductors).