Wow, I just read that guide today. I had pretty much given up on chaining, but I figured I'd give it a try on something easy (Geodude).
I didn't bring a synchronizer because I figured it wouldn't work, as usual, but I made it to 40, and kept going.
And caught 6 shiny geodude. :3
Jolly, Adamant, Adamant, Calm, Sassy, Bashful.
So happy, first shinies I've ever found on D/P.
Edit: IVs
Jolly 22 / 1 / 8 / 30 / 18 / 13
Adamant 26 / 10 / 28 / 1 / 3 / 24
Adamant 12 / 16 / 13 / 11 / 28 / 25
Calm 8 / 25 / 31 / 24 / 29 / 7
Bashful 26 / 11 / 19 / 15 / 24 / 27
Sassy 11 / 22 / 25 / 20 / 10 / 30
They are oddly all female. o.O