Repeating what I said in another thread, but I tried and failed: using a current HP of 11 (which should be easily high enough to avoid triggering the 3hp measurement), a 252 hp Breloom of around level 56-58 (I can't remember the exact value) had its current HP go up on Diamond after feeding it a Pomeg Berry, and a level 70 Lugia with around 180 HP EVs (I EV trained it in a hurry to test, so don't know the exact value) stayed at the same value, 11 HP upon feeding it a Pomeg Berry, on Heart Gold. Therefore, if a 4th gen Pomeg Glitch does exist, my feeling is that it's only on Diamond and Perl.
One obvious thing to test that I haven't yet (and probably will, at least for Diamond and HeartGold, if nobody else does first): what happens (on Emerald, Diamond/Perl, Platinum/HGSS) if one of your Pokémon is fainted, and you put all the others into the PC? What if you have there's also an egg in your party? This would seem to be a trivial way to get the same result as the Pomeg Glitch, unless the game specifically tests for and blocks it.
One obvious thing to test that I haven't yet (and probably will, at least for Diamond and HeartGold, if nobody else does first): what happens (on Emerald, Diamond/Perl, Platinum/HGSS) if one of your Pokémon is fainted, and you put all the others into the PC? What if you have there's also an egg in your party? This would seem to be a trivial way to get the same result as the Pomeg Glitch, unless the game specifically tests for and blocks it.