That's alright...The premier ribbon is a fake ribbon. No known event pokemon have it, and I honestly don't know how you would get those particular ones for free.
No, they don't have any adverse effects ingame, other than that you cannot trade them over GTS--period. Yes, there are event ribbons for pokemon, but the Premier Ribbon is both fake and hacked onto the pokemon, using methods that I don't know...Nor do I care to know them.
The simple reason that the ribbon is there pretty much puts a black mark on any pokemon that have it...Some regard them as total hacks because of that one ribbon, others simply hate the ribbon itself, and others place little to no value for any pokemon that have that ribbon.