Ugh. I just lost to this Walrein the second time in a row (69 streak lol). Sleep talk selected Sheer cold/Fissure every time and didn't miss. The worst part was that I had two chances where I could have killed it, only for Lax incense hax to kick in. Oh well, third time lucky.
880 | Walrein | Bold | Lax Incense | Sheer Cold | Fissure | Rest | Sleep Talk | Def/SpD
I'm using a Latios / Milotic / Metagross team, and its been fairly effective. It still needs a bit of tweaking before its really solid, but its been serving me well. Before I was using a generic cripple opponents and then set up team. However, I began to find it boring and I lost my streaks early just being inattentive. Anyway, I think this team (or at least some variant of it) can go far, and so I'll be updating when I achieve a good streak.