>>38265158It's not about type advantages, its about the design. By looking like a Bug, it wouldn't make sense for a bug type to attack it or, at least, not for the reasons they may attack a grass type.
>storm drain-esque boost ability from being hitThe thing is, it doesn't want to be hit by them. At most they could have given it something that makes Bug-Type Attacks do neutral damage instead of SE, a la Dazzling and Queen Majesty (psychological-related reasons).