Did with Mechanical Pandaren Dragonling: 1/2/2, Pocket Cannon x/1/2 and Iron Starlette 1/1/1. Used: Decoy, Thunderbolt, Breath until Dragonling died (Not thunderbolt).
This left Geode low enough for Pocket Cannon to finish with 1 frost shot, did not use plating. Used another frost shot before cannon died.
Iron Starlette finished with Wind Up, Supercharge and Wind Up. I know this alternative requires a bit of RNG on the Rock barrage hits, but if you're like me and don't have lifelike toad leveled, it's an alternative try until it works.