Water shouldn't be weak to Ice, but it also shouldn't resist Ice.
>>48854786Water and Ice aren't quite the same, since former is the element itself while the latter has always been more about low temperatures with water serving as a medium to apply the cold.
Agreed about Rock and Ground being fused together into Earth though, you just need to come to an agreement how both rocks and grounded attacks should affect flyers (maybe just make it a blanket immunity to grounded attacks regardless of type but that could make them overpowered).
>>48855598I always figured that, in a Pokémon setting, it's much easier to generate heat than disperse it, meaning Fire types can withstand the cold while Ice types have a much harder time regaining their cool.