Guys instead of trying to prevent Deo-D from setting up two layers of hazards, why not simply 2HKO it, allowing it to set up only SR? I can can name you plent strong attackers that are faster and fit perfectly in most teams. Gengar, Bug Buzz Genesect, CBTar (doesn't outspeed but OHKOes), Specs Keldeo, LO Keldeo, Specs Latios LO Alakazam, Sheer Force Landorus, CB Garchomp, Thundurus-T, LO Garchomp, Volcarona, Scarf Toed and CB Terrakion. Notice how there is a wide variety of offensive Pokemon that can prevent Deo-D from setting up 2 layers of hazards. If you don't want to be set-up bait after you 2HKO Deo-D with your choiced move, then Landorus, LO Keldeo, LO Garchomp, Volcarona, Gengar, Alakazam and Genesect are all perfectly viable alternatives.
And i haven't even touched on the Magic Bouncers or rapid spinners yet.
So i ask again are we going to ban a poke because it can guaranteed set-up SR? Because i know pokes that can do this job way better.
To me Deo-D is a very threatening mon, that excels in its role, but is totally manageable if you know what you do. You just gotta prevent him from having his way with you in the lead match up, and then if you are able to keep offense pressure, all that Deo-D will be is a nuisance. If stall was more viable in this meta, then i could think that Deo-D might be broken, as Deo-D fucks it up really big time, but as of now he is fine.