LogFAQs > #984649851

Doubles is less stall-y because inherently you can double up into a single mon so stall strategies have actual counters. That and several moves that are weaker and AOE to boot, it gives more edge than singles where it's constantly shuffling around til you get 1 good rotation into knocking out 1 Pokemon that starts a big chain. You can lose 1 Pokemon in doubles and still have a chance cuz it's much easier to trade in kills. It's also much harder to do a big setup strat in Doubles because you can double up.

Even though most of the Pokemon games are singles, which tbh is Gamefreak's fault for being incapable of designing a good campaign, the competitive is doubles. If singles was actually that much better, there would be demand for a different official format, but there really isn't