this team is really good from what i have heard on irc and it looks really swell as well. i cant truly "rate" it because its obviously been pretty much the most successful team in uu for a while but i can offer a suggestion / make a question:
is quagsire a better choice than gastrodon? obviously on a team like this, you want as much freedom in moves as possible. trickers really ruin this and gastrodon's sticky hold allows you to avoid the troubles of trick. quagsire does have water absorb yes, but with shaymin and careful gastrodon, water isn't "that much" of a problem, especially because gastrodon can use recover if his hp gets too low.
this is a really good team though, im just curious if you have tried gastrodon out because i could see him fitting in well.