I show you an Add-on that for the moment adds pika but if it is too supported I will take out more and more mobs.
This version of the Addon is in beta, but if it comes out of the beta pika will have 100 levels that will be rising from time to time, there will also be the evolutions and pre-evolutions.
DISCLAIMER: This is an unofficial application for Minecraft Pocket Edition. This application is not affiliated in any way with Mojang AB. The Minecraft Name, the Minecraft Brand and the Minecraft Assets are all property of Mojang AB or their respectful owner. All rights reserved. In accordance with http://account.mojang.com/documents/brand_guidelines