GameFreak getting lazy?

[JarJar]

Sevipers eat Zangooses? I thought Seviper had a weakness to Zangooses?
It's just a reference to how mongooses can kill a cobra in a fight.

And yeah, they screwed up the logic in the games and anime.

In the games, Seviper is a poison type, and Zangoose's ability is the immune ability, meaning it can't be poisoned, so it does give it an advantage over Seviper, if not then balances them out, that's the real reference right there. They're rival pokemon, they don't eat each other, just fight each other. Idk where the eating part came from.