He has 3 different abilities that can stun/sleep a pet and has strong beast attacks to kill critters that cannot be CC'ed. If you have any teams where you need to switch a particular pet often, he might be a good additional. A dazzling dance team could complement his horn attack. Prior the the addition to resilience, he was pretty good in PvP. He's tougher to work with now, but he does have a lot of options for CC at least, so if your opponent switches after being CC'ed, you can still go to town.
Carry Pet Experience Reference Guide: