Here's how to tame a phioma:

1. Bring some bolas

2. After you find a phioma, throw the bola at it

3. Then start hitting it with a club, or shoot at it with a tranquilizing ammo like tranq arrows or certain darts.

4. Keep hitting it until it's knocked out. After it's knocked out, feed it berries, veggies, or preferred kibbles.

Hope this helped!

-Pablo27