Assuming the recent update on Evasion abilities being banned. None of that or mons that had only them.
It would be BW minus the BW mons. It would be more of a matchup based meta with a heavy emphasis on switching and trapping. With no team reveal, you can start your offense at your leisure though.
The power would be different on the rain side. No Keldeo, Analytic Starmie, or Thunderus-T, but also no Ferrothorn, Latias, or Storm Drain Gastrodon to take the Hydro Pumps (no boosted Scalds at least). The lack of the offensive tools wouldn't outdo the lack of defensive ones, so I think Rain would be the top. Sand would still be great because Hippowdon is great as a setter not worried about Dugtrio, plus you still have two of them if you count Tyranitar being great in DPP to begin with.
Actually, Sun would absolutely suck nuts, let's not forget. No Venusaur and a shitty weather starter. Hail sucks even worse and no cheeky evasion strats.
Quagsire will get a lot more use. Run physically defensive variants, as it's the only thing that can take on BoltBeam while also being able to check Kabutops. The Electrics woild run HP Grass more often to hit it.
Kingdra's still a huge threat to any team regardless of type. Quagsire has to watch for Draco Meteor. SpDef Celebi is decent there, except it needs to watch for Ice Beam (good investment blocks the 2HKO). Empoleon takes both STABs.