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Grass, Poison, and Ice types (ESPECIALLY Ice-types) are a real bugger to fix because you can't change any of their type chart effectivenesses without it either not making sense, or screwing over another type.
Let's make Poison neutral on Grass! Yeah, because Poison is so stellar offensively already.
Let's make Ice resist Grass! Except Grass really doesn't need to barely tickle ANOTHER type, already hitting a whopping 7 types for NVE damage.
Fortunately, Grass and Poison have great support roles - Grass being immune to spore/powder/Leech Seed, and Poison being immune to poisoning AND a 100% accurate Toxic, and usually these two types are paired up together. Grass also gets Aromatherapy and all those aforementioned spore/powder moves and Leech Seed. Ice is just really screwed up, though. Really nothing going for it.
The only changes I can see working out well would be:
>Make Water NVE on Ice, but keep Ice being NVE on Water. (Freeze-Dry exists as a work-around, anyway)
>Remove Ice's weakness to either Rock or Steel, depending on how much you hate sneaky stones, I guess
>Make Grass resist Fairy
