Evolutionary Helper mod is a real find for every Minecraft player on Android. It allows mobs to evolve. So, for example, a chicken first becomes a chicken, and then, if you wish, it can turn into MCPE into a phantom. To do this, you will need to craft a special potion, it is available in MCBE in the recipe book.
So it goes. So far, the Evolutionary Helper mod works in Minecraft Bedrock Edition only with hens, pigs and cows. However, the result that the mod has is enormous! You will definitely enjoy this gaming experience in Minecraft BE.