Looking for tips on how to handle Tailwind setters such as Suicune and Zapdos, found my team unable to stop them and when it is a pretty speed oriented team it falls behind when the opponent will be able to always go first after the first turn. :(
My team has the same issue: very middling Speed (4/6 of my team is outsped by max Speed Adamant Bisharp/Breloom/Metagross) plus Tailwind, which means pretty much any other team with Tailwind outruns me. Which is to say, pretty much every non-TR team you'll ever see on BS Doubles lol. Typically how I compensate for this is with bulky, powerful attackers (Char-Y, Mega Venusaur, Aegislash), Fake Out (Mienshao), and stalling out Tailwind (Protect/Sleep Powder/King's Shield) and then setting my own 2-3 turns after the foe with my own Tailwind setter (Mandibuzz). I have battle vids of me overcoming faster Tailwind teams with nothing but Tailwind if you want to see that.
But putting aside bulky offense, you can also run heavy Speed control. Tailwind + Icy Wind Suicune can set Tailwind and help destroy the Speed gap of faster Tailwind teams. It's very passive, though, and leaves your ally in a bad spot of the opponent being able to largely ignore Suicune. Cresselia lacks Tailwind, but Icy Wind/Thunder Wave/Trick Room can bring things down a peg. Even if its not a 0 Speed, -Speed natured TR team, Trick Room will put you at a powerful advantage against Tailwind. Running Tailwind and Trick Room on the same team isn't absurd either.
Prankster T-Wave is annoying as fuck, but the easiest to counter. Ground and Electric types, Lightningrod, Lum Berry, and Quick Guard render it utterly useless. Quash, nothing is immune, but it limits you to Murkrow and Sableye. Not that either of them is bad. Murkrow has an absolutely horrifying array of Prankster terror, with Tailwind, Quash, T-Wave, Perish Song, Taunt, Featherdance, Screech, Confuse Ray, Spite, Haze (Draco + Haze = fun), Mean Look, and Rain Dance/Sunny Day (if you want a certain weather archetype to cry). Kinda frail though, even with Eviolite and Prankster Roost. Sableye has WoW and better typing.
Tornadus-I and Whimsicott have Prankster Taunt + Tailwind. Whimsicott can outrun Thundy and Taunt it before it Taunts you/uses
Dick Thunder Wave, and has a Prankster Tailwind of its own. Also has the power to cripple anything that uses Trick Room, Tailwind, Protect, King's Shield, etc. with Encore. It's completely dead against Quick Guard though. Tornadus-I is a viable alternative, with the same Prankster Tailwind+Taunt, offensive presence, and different typing if Whimsicott stacks weaknesses. Also has Icy Wind for "seriously, fuck off, I will Taunt your TR, Tailwind your Tailwind, and then Icy Wind your ass".
Talonflame, priority Tailwind + Brave Bird. Cliche, but it works.
If you want to pull an "ultimate asshole" move, Snatch a Tailwind.
Hopefully some of this ramble is useful xD