ShinyLatios
Nintendo 3DS Legend
Towns Folk
Let's compare in terms of weaknesses real quick:Ice has less weakness than grass it just have one defence against itself wich is awful, if you want the worst type I'll give you Rock !
Grass: Flying, Fire, Bug, Ice, Poison
Ice: Fighting, Fire, Steel, Rock
The thing is, imo Ice type has more common weaknesses than grass, although grass itself isn't that much better. With that said though, yeah Rock is terrible. I kinda feel bad for Aurorus (Lileep on the other hand seems to be ok)