I really like the 4Kids dub, but Elm's voice...yeesh. So bland...not bad, but so flat. But, it's still better than my all time worst of...
...Rowan's voice. He sounded like Frank'n'Furter to me, or some guy mumbling stuff to himself all the time no one could understand...that was the worst one to me.
I really like Kristine Hvam as Professor Juniper, though. She's quite good, IMO. :D
Scott Williams was surprisingly very good as Darkrai.
Tom Wayland's Dwebble is my favorite of his voices. :)