>>31928703Shedinja, Togkeiss with Defog, and Mega Sableye is the main core. Next add a Ground-water type (Quagsire or Seismatoad are best, Quag if you fear setup sweepers, Toad if you fear Rotoms) a reliable taunt user that can beat Clefable (used to be Talonflame but that's dead in the water, have had limit success with Crobat) and finally Dugtrio with a Focus sash for taking care of Stallbreakers.
Keep the hazards away with Sableye and have Togekiss use Defog if they do go up. Enjoy walling stuff with Shedinja to oyur heart's content. This team does exceptionally well against rain teams.
Second most cookie-cutter stall, a bit more well-known because it was popular in previous gens:
Skarmory/Chansey core with Slowbro and Amoongus for Regenerator nuisance shenanigans (might want to use Toxapex instead of Slowbro these days...) Round it out with Heatran and whatever win condition you fancy and you're set to play gen-5 "Classic" stall with a FWG core, Skarm, and Chansey. This setup walls most threats but has trouble with certain setup sweepers and certain mixed attackers.