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For the most part the easiest thing to do is basically have something else there to spam really fucking strong Blizzards at 100% accuracy.
Bring in Trick Room so your 60-30 base speed becomes a good thing rather than bad.
In my case, I used Tailwind, because 30 base speed naive maxed x2 is just enough to outrun base 110s in level 50 double battles, but only enough to outrun base 108s in level 100s.
It works decently enough, but it requires I have my Articuno leading, which leads me susceptible to both rock slide and heat wave, incredibly common moves in doubles. So I bring in a Garchomp and a Hitmontop to take care of rock/fire types running those moves once something dies. Articuno has to be sure it sets up though, and Abomasnow has to live long enough to be able to take advantage. Against people who actually do double battles, they plan for this shit, so they have stuff like taunt and fake out to stop setups, which you have to prepare yourself for if it's something as obvious as that.