Tranquil Mechanical Yeti
By using a character with engineering 250+ and after completing Lilith the Lithe's chain of quests in Winterspring, the Tranquil Mechanical Yeti can then be trained. Since the Yeti can be traded, you have the option of purchasing it from the auction house. Water Waveling can be found alongside Crazed Water Spirits at Drak'Sotra Fields, south of The Argent Stand. The Kun-Lai Runt is normally found walking along the various mountain paths in Kun-Lai Summit. It should be noted, that if you are looking for a rare version of the Tranquil Mechanical Yeti, you must use a battle stone which, once made are considered to be uncommon rarity.
As Tranquil Mechanical Yeti is the only pet with Call Lightning, it is considered to be quite unique given it is mechanical structure. Even though I chose not to use it in this setup, the Ion Cannon (a personal favorite skill to use) adds to the overall strength of this Yeti. In addition, if you are faster than the opponent pet, Thrash does a considerable amount of damage at max level. The reason I included the Yeti in this example, was based on the second slot ability - Call Blizzard - and the resulting effect of chilling the other team. We will return to this point in a bit.
The Water Waveling is your standard elemental pet. I specifically chose him as his abilities compliment those of Call Blizzard , where a round casting Frost Nova chills the target. I decided to choose geyser for the third ability based on the fact that even though it does not instantaneously do damage, the added stun effect makes this attack worthwhile.
The third pet I use in this set-up was is the Kun-Lei Runt, a heavy-hitter alone, but whose abilities are also compatible with those of the Water Waveling and of the Yeti. The third slot ability, Deep Freeze, which has guaranteed one round stun if the target is "Chilled" when coupled with Takedown deals double damage on the following turn. Mangle was added since I felt it was the best out of the two slot attacks.
I devised this combination as I was working through the Pandaren Grand Master Pet Line. This strategy requires a bit to setup, effectively and can be defeated by a pet who can either clear weather effects or cast another overriding weather effect. However, with the current meta game on Pvp pet battles, I rarely come across that issue. When I battle, typical I lose both the Yeti and the Elemental rather quickly,but the setup I provided for Kun-Lei Runt is too strong for the enemy team. The added fact that the abilities cross a wide range of ability types, with each of the pets being a different type makes for a overall strong team.