Well, the hidden data has not been extracted yet, however there is a very high probability that pressing Y won't do anything. Except activating the PokeRadar assuming it's registered ;)
There have never been such things like pressing certain buttons to increase the chances of whatever in the Pokemon Series to my knowledge - it might just be false luck you're having. :3
Of course, the chain increases, and sooner or later you WILL find a shiny patch. Having the PokeRadar registered doesn't affect the chances though.
It's like whenever I play Candy Crush Saga - whenever I turn the sound off, I tend to completely harder levels more often. Though there's a 99% chance that doesn't effect anything xD
Hope I helped. :)