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Primal Kyogre should be Water/Ice, for several reasons.
>it has bunch of white all over it (yeah yeah, whatever)
>primal groudon getting an additional type, while its counterpart doesn't is just weird
>land and sea aren't that great of a duality, but fire and ice are. it would make the duo of a yin-yang thing, the hot, molten land and the cold, deep sea
>even rayquaza has two types, so it feels imbalanced the way it is
Also, Kyogre was always notable for easily being able to beat the other two members of its trio in-game. But if it was dual typed;
>the ice type would nerf it more than help it, (which is a good thing,) doing little more than giving it additional weaknesses
>ice is only neutral on primal groudon, so it wouldn't help it
>mega rayquaza's ability makes ice moves do less damage