Is there any particular reason you're saying this? In DPPt, when you breed Mantine you get Mantyke. This wasn't true in previous generations. This is just an example. There's no reason why something that doesn't cause a pokémon to evolve in one generation won't cause it to evolve in the next one.Impossible. It can't evolve with a Moon Stone in DPPt, it won't evolve with it in 5th Gen.
Same here. It didn't evolve by this method back then, it won't evolve now. Unless, of course, you need a new hold item to do so...
Edit: I realize it's not exactly the same as evolution but it's a similar idea.