I have heard that tipping NPCs boosts the shiny encounter rate. I don't know by how much or for how long, but there are enough accounts of it happening that it's likely not just coincidence. I hadn't tipped anyone recently, but.
Supposedly the Friend Safari has a boosted encounter ratio for shinies as well.
I got a Protean Froakie on GTS in exchange for my Xerneas and once I get to breeding for a good one I will gladly share the others. If you haven't seen one in the Battle Maison let me break it down: Protean changes the wielder's type to match the move it's about to use. As in, before it uses it. As in, every attack a Protean Froakie uses will be STAB. AS IN A PROTEAN FROAKIE'S ATTACK AND SPECIAL ATTACK STATS MAY AS WELL BE PERMANENTLY 150% THE LISTED NUMBER WITHOUT AN ITEM'S HELP. And it's got the speed stat to use it. If you get a Protean Froakie I hatch, you bet your breakfast it's gonna be Timid.
If that makes Greninja good enough to be banned to Ubers and makes Frogadier good enough to use in at least RU... well, I do like Greninja, I got over my initial dislike of it quickly, but I like Frogadier even more... but don't take my speculation as being worth anything. All I can really say is that Protean is an obscenely good ability.