>>46248429They don't fight straight, but rely on confusion, life leeching, surprise and death from a thousand cuts. While being literally poisonous is not their focus, their focus is being tricksy and annoying, unlike all other Flying types in their generation (which either are straightforward Wing attack & normal attacks spammers, or are primarily elemental with Flying typing as an afterthought). And while today Poison type is mostly taken literally (which correlates to a sharp decline in number of new Poison types) and "being tricksy and annoying" is relegated to "mental" types such as Dark and Fairy, or abilities — you should remember that Poison type's face in Kanto is Koga, a ninja who praises these qualities. And Zubat line has these qualities.