"Does ur opponent get two prizes if Broke's Ninetales shapeshift to an EX evolution card?"
I would assume as much (you mean if it is knocked out).
For the second one, from the compendium:
Q. What happens if you slap Kingdra on a Brock's Ninetales and try to use Genetic Memory?
A. Nothing. If you attach Kingdra on a Brock's Ninetales it is only treated as that Pokemon. Genetic Memory ONLY lets you use attacks from Kingdra's basic or evolution cards and there aren't any of these in this example. (Oct 18, 2001 WotC Chat, Q17; Sep 19, 2002 WotC Chat, Q471)
Q. If you Shapeshift into Kingdra, can you use Hypnotic Gaze or whatever from Brock's Vulpix with Genetic Memory?
A. No you cannot. (Nov 1, 2001 WotC Chat, Q67)