One day, exploring the forest, you found a small wild Rattata. You cautiously approached it and had your pokeball ready to catch it, but the little rodent noticed your presence and quickly leaped towards you, biting your arm, only to then flee into the deep forest.

You then fell to your knees in pain. Your arm had swelled up, and you quickly felt dizzy. Before you could have opened your backpack and obtained a healing potion, your arm began to mutate, and a thick amount of purple fur began to spread from your limb, moving up your torso. You panicked, just as you felt your body shrink, and your head, arms, and legs transform into what appeared to be those of a rodent. In about 1 hour, the transformation will be completed. You have to hurry before you shrink completely and get the appearance of a rattata.