Bug shouldn't be a type, it isn't an element. The weakness chart doesn't make any because it's all arbitrary and only loosely makes some amount of logical sense some of the time
The typing system in general should be redesigned to consist of two strata of classification, "Elemental" types (Fire, Water, Electric, etc.) and "Phenotype" (Bug, Flying, Dragon, etc.), the difference between what powers a pokemon has and what it's actual place in the natural world is
