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Alolan Serviper and Zangoose
Zangoose Poison/Fighting
Immunity/toxic absorb
Serviper became an invasive species on alolan island, so zangoose were introduced to cull the population the strongest Zangoose survived to fight off the great serviper population, and eating poisonus servipers and being stung by their venom led to the Zangoose developing their own toxins
Serviper
Poison/Ground
Eventually Servipers fled to the under ground caves of the island to escape from the stronger and poison resistant Zangoose. being underground led them to become part ground type
