>>37351273Depending on order of turns, Solar beam gets no chargeup turn and gets Kyogre immediately. That being said, Groudon has no Grass type advantage while Kyogre's a water type.
Megaevolution only makes Groudon 4x weaker to water Groudon was clearly the weakest of the trio but he was pretty okay on his own. Certainly not the worst legendary out there.
Fucking Regigigas. 
