Man, it'd be a downright shame if Ribombee didn't see much use in WCS (VGC) 2017. This lil bee fly could be one of the best clerics in the Doubles format. 124 speed is downright awesome, and having access to a signature move that damages enemies, but heals allies when used on them is glorious! 95 Sp. Atk is decent, and access to Quiver Dance could make it a decent Pokemon to use in Singles. A somewhat small offensive movepool and lack of coverage to deal with Steel and Fire types is concerning, so running HP Fire or HP Ground is a must if you're worried about that sort of ordeal. Bulk is, unsurprisingly, mediocre, with 60/60/70 bulk, but taking hits is not what it's made for, and the high speed and decent special attack somewhat offset this. The role that it fills is very important, and that is supporting its fellow teammates. With Speed Swap, you can give the slower, more powerful Pokemon a chance, especially if it goes by the name of Wishiwashi, but feel free to use it on any Poke who needs it, like say... Mega Camerupt? Anywho, besides Pollen Puff and Speed Swap, there are still other essentials, like Baton Pass for benefitting your special attacker after a Quiver Dance boost, Skill Swap to aid Pokemon by the likes of Regigigas, Archeops, Golisopod, etc, Aromatherapy to heal status, Stun Spore to slow down fast attackers, and a few other options in its disposal. These tools could make Ribombee a bit of a pest in Doubles, and could pave the way for a win if the right steps are taken.
That aside, there are still a few tools that can be utilized, like dual screens to reduce overall damage to you, as well as Roost to keep you healthy, though the lack of bulk might make the latter move ineffective. Still, don't sleep on this little guy, as it could be a real important part of a WCS (VGC) team.