And why?
Pleaselog inorregisterto add a comment.
In real life, snakes and mongooses are biological rivals. They’re like the stereotypical Dog/Cat fights going on through the ages. Mongooses have also developed antibodies, and are immune to snake venom, which is seen through Zangoose’s Dream world abilityToxic Boost, which gives him an advantage of seviper.
I’m guessing it is the pokemon they are based on- Zangoose is a mongoose & seviper is obviously a snake. Mongooses are a snakes natural enemy/predator explaining zangooses immunity & toxic boost abilities that at first sight come out of the blue. I guess that is the cause of the ancestorial rivalry between two of my favourite pokemon.
Hope this helps:)