I've got, 2 shiny Clawitzer [one was traded for a Shiny Skrelp], a shiny Clauncher, a shiny Gyarados, a shiny Togepi, a shiny Stunfisk, and a shiny Relicanth.
Sadly, all tipping does is give you a medal, it doesn't increase the shiny rate. And I'm guessing we all know about consecutive fishing by now right? There is no evidence of the shiny rate being increased in the normal game either, though it's thought to be higher in the friend safari.