Good point the Knee, I forgot about him, however he might seem great, he actually isn't that good imho. Starting first (and thus letting your opponent always go 2nd) isn't perse a good thing. I and multiple Kingdra decks would love the assurance of going 2nd and thus using supporters/trainers.
However if there will be a instant supporter that will place things on the bench/pokemon, sableye is worth. But at the moment we don't have that much fantastic supporters. Because read well. Sableye's attack is that of a supporter effect, but roseanne and bebe's only place the pokemon in the hand thus only useable in your next turn.