If you wanna find this guy in mobile here's some locations

1 redwoods

2 argy mountain near the snow biome where the arctic starts

3 griffin mountain

4 herbivore Island

5 near the green and red obelisk

6 near the volcano

7 checkout near the hidden lake biome

8 checkout biomes near your base

And if you don't find after exploring these locations just come at your base and do the tidy save for the 10 times and go again for exploring these locations.

I have also find my unicorn after doing these trick in redwoods behind the redwood mountain it was lvl 20 male i killed it and took the implant and then harvested the body.

Hope you will find your unicorn

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