Gargra

Easy fight for those with Lil' XT and any pet with Decoy
slot one: leveling pet (can be lvl 1 as he or she will not take any damage)
slot two: Any pet with Decoy (this will be the only move used on this pet)
slot three: Lil' XT (Lightning bolt,Heart Broken, Tympanic Tantrum)
1: attack once with your pet to be leveled and swap to pet with Decoy
2:cast "Decoy" swap to Lil' XT
3: cast Heart Broken,
4: cast Tympanic Tantrum,
5: (last pet should be in now with very little health) Cast Lightning bolt
6:Victory Dance!

I used this team when working on the Overstuffed achieve:

Darkmoon Zepplin (missile, bombing run, decoy)
Menagerie Custodian (zap, shock and awe, ion cannon)
Elekk Plushie (nothing that matters)

1. Start off with DMZ vs wolf #1, decoy, bombing run on cool down and missile as filler. Repeat until wolf is dead.

2. Once first wolf is dead, swap in plushie for 1 round, then swap back to DMZ and use decoy and bombing run on cool down. It's okay if the DMZ dies. Once DMZ's dead, bring in MC and wipe the floor, saving ion cannon for the 3rd wolf.

3. Grats!

Terrific way to level pets! Gargra always starts with Wolfus and 'prowl'. I put my lvl 1 pet in the top slot so it is the first pet up. I use whatever attack it has available for the first round and then swap out to my Darkmoon Tonk (using missile, shock and awe, lock on) and use it to take out the first wolf and most (sometimes all if you're lucky) of the second wolf. Then I switch to my Darkmoon Zeppelin and use Missile/bombing run/thunderbolt to finish off the remainder of Gargra's team. When the battle's done, my lvl 1 pet is a lvl 10 pet. I've also used other mechanical pets with success. It's just that the Tonk/Zeppelin combo is my favorite.