"Yungoos & Alolan Rattata theory"

I think based on the evidence it's almost certain that the leaks are true and we're getting a new Dark type Rattata line. Here's why:Yungoos' pokedex entry states they were brought to Alola to deal with overpopulation of 'a certain pokemon'. Speculation was already that this referred to Rattata.In real life, mongoose were introduced to Hawaii to deal with rat populations. This was unsuccessful as the rats proved to be nocturnal and the mongoose rarely ran into them.What if Rattata in Alola adapted to become nocturnal and therefore avoid the Yungoos, inheriting the Dark typing? via /r/pokemon http://ift.tt/2aUGQKH