You went to visit Alola since it was the most touristic islands in the world, as you spent days there, it was very tropical and was almost like Hawaii.

One day, you were walking down the forest when you found a massive cave, as you explored it, it was infested with rattatas! Here rattatas were sinister type and had a black thicker fur, they all attacked you when a screech was heard and they all stepped away, revealing a 2'3" Raticate, she was very thick and had very big cheeks and whiskers, as well as uh... A very big chest

Bertha:"Trainer! You dare step into our cave?!"

She crossed her arms, having to move each of her mounds so her rodent arms fit below them