It'll probably be best to get those predictions skills working awesomely. For example, using a Water move on Skarmory rather than an Electric one...so that the Ground-Type that'll usually be switched in never gets a chance to do anything. :D
Well I think you should get rid of that Metronome, as it's way inaccurate and unpredictable.
And then just try to predict your opponent's actions. For example, do you think I'd really keep Poliwrath in against a Luxray? Nope. So, instead of using an Electric Attack, go for an Ice one. It's most likely be super-effective again the switch in(ie. my Flygon).