Spawner Craft
In Minecraft on Android, mob generators can only be created in Creative mode. However, you now have the chance to do so by downloading the Spawner Craft mod.
The creator has not yet completed all crafting devices, so don’t worry if you can’t find one in Minecraft. Fortunately, the latest update introduced three new ones:
To operate the devices from the mod, it’s essential to consider the habitat of each mob in Minecraft PE. For instance, skeletons require darkness, while squids need water, and so forth.
Utilize a basic block for all monsters and creatures.

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The sheep in MCBE

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Wishing you the best of luck!