Lilyoptra's Comments

Tips if trying for a rare color (white in this case):

1. Use blue 25's with a heal ability.

2. Try to find a situation where the pet you want fills both back slots-double the chance each attempt.

3. Its helpful if all the enemy pets are grey/white.  Makes it easier to succeed as you may start the fight with reduced health.

4. An area with no agressive animals makes it easier to keep redoing the fight as well as no chance to accidently kill the pet you are trying to fight. 

Seems the covenant restrictions have been removed.  My Fae is able to summon and level it.  Guess they figured they went a bit too far with covenant restrictions on pets.