Maybe it's because I'm still fighting lower-ranked players, but my OU team (which isn't arranged for CAP) is doing pretty well right now simply by virtue of having a Balloon Heatran with Taunt. Everyone is using Sun, and most people seem to be relying on offense to check Heatran, so a lot of these Malaconda teams are really getting manhandled by neglecting to have an actual answer to boosted fire attacks. Granted, I'm not sure if raising Heatran usage is really in the spirit of "raising UU type usage"--the problem is that even if fire is a lesser-used type, an OU fire type like Heatran will still outclasses things like Charizard and Entei regardless, so all this Malaconda Sun team mania doesn't really improve the usage of any lesser-used pokemon to my knowledge--it just increases the usage of pokemon that are already OU that happen to have those lesser-used types. The same goes with bugs. Yeah, there are a lot of bugs out there who could do extremely well against Malaconda, but it doesn't matter when Scizor and Volcarona already outclass all of them anyway. And increasing Scizor usage isn't really my image of "diversifying the metagame."