I personally like the Cogblade Raptor
against his monkey pet, simply follow up Screech
, which will get an extra "strong" attack in due to being quicker. It helps. With the Mechanical pet's resurrection ability, it should be enough to beat him. I've learned not to pass if I'm stunned, so usually I have another pet in the fight when he brings his monkey in. Once that is stunned, I'll switch to the Raptor. I've found that if we're evenly matched at the end and I can weather his first two pets, the Raptor will almost always emerge victorious.
As far as using a lowbie pet for the xp goes, I use Lil' Deathwing to weather the first two pets, then send in the level 1 when the Tamer send out the monkey. Immediately, the monkey will stun, doing no damage, and I can switch to the Raptor to finish it off. Not everyone has a pet that will be as effective against the first two pets as Deathwing, but I'm just offering my own strategy, there.