Hi there ske7ch6336, thanks for your interest in doubles RU. I can tell you that it is not a very played metagame. I am afraid your question is not in the right place either.I suggest you read
Smogon Metagame and Resources, this should tell you everything you need to know. For future references asking questions like this should go in the Simple Question, Simple Answers thread (SQSA).
Have any questions and I would be happy to help you. Just shoot me a Vm.