Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
I'm testing this out for a Shiny Azelf first. I get this seed A21003A7 at the 16th hour, 2017. After I get this seed, what do I do for Azelf to appear shiny?
That depends, when you searched for a shiny spread, did you note down what the frame is? If so, you can put the Seed in the main window of RNGReporter and then advance, using Chatots, until you're -1 frame of you target and start the battle. :P (in a nutshell)
No, one frame. But by flipping from Chatot to Chatot, you essentially advance by 2. If you use the Logbook (on a page where it says you caught a Pokemon), it does advance 2. If you need to advance a lot of frames, flipping between two pages with mons is faster than Chatot flipping.