Is there something I am missing for the skills tree that is under the proficiency area on a pet? I think nderstand that they unlock at the different levels but under the first skill is a set of 5 stars that seems to need to be filled up to reach the next rank of said skill. Mine never changes. I saw a post awhile back about level up points but seem to see that they are still around. What is the skill tree down there for now and how to I raise the rank of each skill?
Thank you

I'll admit, I didn't know myself, so I looked at the Proficiency Tutorial. Under "Additional Information For Higher Level Pets" is the following passage:

As a Pet increases in Levels, it will eventually unlock new Abilities based on its Element. New Abilities are unlocked at Levels 30, 65, 70, and 75. The first Ability for every Element is an Attack, or an Ability that generates Mana when used. The other four Abilities for each Element are Finishers, or Abilities that consumes Mana when used. When selecting an Element for higher Level Pets, be sure to browse the available Abilities carefully as they vary greatly and are very unique to each Element.

Once a Pet has reached Level 60, it will begin to earn Expertise by Battling against similar Leveled Enemies. Each Pet will have its own Expertise Rating for every Ability in each Element. As a Pet's Expertise Rating increases for an Ability, that Ability will eventually Rank up to the next Rank; increasing its power in Battles. Each Ability can reach the maximum Rank of 5. Additionally, switching a Pet's Element will NOT reset their Expertise Ratings. Those ratings are retained and will be exactly where they were if you decide to switch the Pet back to the original Element.

I hope that this helps.

just to clarify, pets can only gain attack rank exp in the Lost Grove, and the pet's level doesn't matter- pets of any level can gain attack rank exp, it just has to be battling in the grove (it's just that the Grove is liable to trash low level pets, unless you're careful and it's with two high-leveled high-ranked pets)