I love the idea. I love the fact that you are thinking outside the box with this one. It would balance out the typings more, making Groudon's ground attacks deal neutral damage instead of 1/2 damage. This would all make sense if not for a couple of reasons:
1. New Abilities: how the new abilities work make this idea sort of pointless in a Groudon vs Kyogre 1v1. In a 1v1 Primal battle, Groudon will always win because his speed is slower allowing his Desolate Land ability proc last and stick. This gives him the inevitable advantage and easy 2HKO or 3HKO with Solarbeam. Kyogre has the advantage in everything but this area: better movepool, better typing, better stat distribution, etc. Why should Kyogre have an even greater advantage over Groudon?
2. Must-Have Moves: Just as Thunder is a must-have on even basic Kyogre, Solarbeam is a must-have on any Groudon. Even in a non-1v1 situation, they both benefit from their respective moves much too much. But with this in mind, you wouldn't ask to have Groudon be part grass type because of his must-have would you? Just the same, Kyogre is fine without being electric type.
3. Balancing: Groudon was initially just ground type. This means that he does not receive STAB from the types of attacks that benefit from the Drought being active, whereas Kyogre does. This was unfair initially, making Groudon the lesser of the two. Furthermore, Kyogre having the electric typing means that it would receive a STAB bonus from a 100% accuracy Thunder attack. That would likely make Primal Kyogre god-tier along with Mega-Rayquaza, which would be excessive. As it is right now, the two Primal Pokemon are perfectly balanced and in a 6v6 situation, either could beat the other. Thank you.
TEMMEC
1. New Abilities: how the new abilities work make this idea sort of pointless in a Groudon vs Kyogre 1v1. In a 1v1 Primal battle, Groudon will always win because his speed is slower allowing his Desolate Land ability proc last and stick. This gives him the inevitable advantage and easy 2HKO or 3HKO with Solarbeam. Kyogre has the advantage in everything but this area: better movepool, better typing, better stat distribution, etc. Why should Kyogre have an even greater advantage over Groudon?
2. Must-Have Moves: Just as Thunder is a must-have on even basic Kyogre, Solarbeam is a must-have on any Groudon. Even in a non-1v1 situation, they both benefit from their respective moves much too much. But with this in mind, you wouldn't ask to have Groudon be part grass type because of his must-have would you? Just the same, Kyogre is fine without being electric type.
3. Balancing: Groudon was initially just ground type. This means that he does not receive STAB from the types of attacks that benefit from the Drought being active, whereas Kyogre does. This was unfair initially, making Groudon the lesser of the two. Furthermore, Kyogre having the electric typing means that it would receive a STAB bonus from a 100% accuracy Thunder attack. That would likely make Primal Kyogre god-tier along with Mega-Rayquaza, which would be excessive. As it is right now, the two Primal Pokemon are perfectly balanced and in a 6v6 situation, either could beat the other. Thank you.
TEMMEC