Ah, Farmer Nishi- easiest of the Pandaria dailies. Nobody really needs an actual strategy for this trainer. I did, however, get tired of her healing like a resto druid on steroids. I spent some time experimenting with different strategies to get this trainer done in a reasonable amount of time and made a video for the quickest reliable strategy I could find that didn't involve rare pets. http://www.youtube.com/watch?v=F-riyvFGvxQ
If you don't feel like watching a video, the short version is Eternal (or mirror) strider (water jet/cleansing rain/pump), Darkmoon Zeppelin (for burst- missile/decoy/bombing run) and the leveling pet. I find that the damage from Pump with the cleansing rain buff burns through the first two pets in no time. My fastest time with this strategy is 3:17.
Does anyone else time their dailies? Any more efficient strategies? I love hearing about the various different ways to do these.