In Generation IV, the glitch was partially corrected so that a Pomeg Berry could not glitch a Pokémon with 3 or fewer HP (a Pomeg Berry will usually decrease a Pokémon's HP by 2). However, the glitch still exists but must be performed on a Pokémon with 4 or more current HP and 116 or more HP EVs. When a Pomeg Berry is consumed with more than 100 EVs, it resets the EVs to 100. With an EV total of 116, the Pokémon would lose at least 4 HP to reach 0 current HP.
Source
So, it seems that the glitch is in fact possible in Gen 4.
Hope this helps! :)
