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.