Carl
or Varl
Yeah, it's not that rain is a bad strategy, per se; it's just that most people make it their top priority to set up rain dance on turn one and if they don't they lose. These are the people who fill the team with swift swim pokemon and maybe a Jolteon or Toxicroak. This is just too predictable. A solid rain team for 2v2 would be one that can make use of the weather but doesn't need to set it up right away or at all in order to succeed. The problem is that VGC is only 4 pokemon so it's usually not worth the effort to try and "save rain dance for later" because at that point you might as well ignore it completely or choose the more reliable sources of weather: hail via Abomasnow or sandstorm via Hippowdon. Definitely disappointing that a 4 pokemon doubles team just can't properly make use of rain.