It's actually harder now. In Gen I, they had no way of checking if a given Pokémon came from a really lucky guy or just some guy with a GameShark/Action Replay. Now they can at least check for BADLY DONE hacks.
For those of you starting topics about the PS4, there's a PS4 board: http://www.gamefaqs.com/boards/691087-playstation-4
They were never worth anything. Sure I collect the event pokes legitly and I use pokegen for my battlemons. None of the are worth anything in the slightest. Never have never will (unless someone wants to pay me for a pokemon than sure take what you want.)
Currently awaiting: Lunar Knights 2, AC:NL, Pikmin 3, XY, WW HD, LR:FFXIII, X, LoZ U, FFVXIII Skarmory would slap the hell outta you