Thanks to @Magnedeth's Friend Safari, I got a shiny Jigglypuff this morning!
Congrats Man! :D
It's super adorable. Does it have a good nature?
Well I was leading with my Modest Synchronize Gardevoir at the time so I was hoping this Jigglypuff would turn out to be Modest too...but it's Relaxed. I checked with the IV guy and he said its best stats are attack and speed so I'll probably go with a physical moveset. It has a good nature to use Gyro Ball with but Speed is also one of its best stats so I'm debating whether or not to do that.