For my first post I'd like to recommend dropping Slowbro from B rank.
In ORAS Slowbro was a very good check to Metagross but every gross now runs T punch for Pex Steela and Skarm making it much less reliable. On top of that if you want the bulky regen water resist there are so many better options (see Toxapex). In addition pex is a good check to more of the top threats in the meta like mosa and gren. Pretty much the only reason to uses slowbro over toxapex is for the psychic resist but even then the mon with the best psychic stab in the tier Tapu Lele almost always 2HKO's Slowbro with Moonblast and always after rocks.
252+ SpA Tapu Lele Moonblast vs. 252 HP / 24 SpD Slowbro: 199-235 (50.5 - 59.6%) -- 84.8% chance to 2HKO after Leftovers recovery
RECOMMENDATION: Slowbro B -> B-
Edit: Also, the rise of Gengar is also a big problem for Bro
In ORAS Slowbro was a very good check to Metagross but every gross now runs T punch for Pex Steela and Skarm making it much less reliable. On top of that if you want the bulky regen water resist there are so many better options (see Toxapex). In addition pex is a good check to more of the top threats in the meta like mosa and gren. Pretty much the only reason to uses slowbro over toxapex is for the psychic resist but even then the mon with the best psychic stab in the tier Tapu Lele almost always 2HKO's Slowbro with Moonblast and always after rocks.
252+ SpA Tapu Lele Moonblast vs. 252 HP / 24 SpD Slowbro: 199-235 (50.5 - 59.6%) -- 84.8% chance to 2HKO after Leftovers recovery
RECOMMENDATION: Slowbro B -> B-
Edit: Also, the rise of Gengar is also a big problem for Bro