>>35323058per Smogon:
Slowbro was an extremely good, unique bulky Water-type in ORAS OU. It was capable of walling many top-tier threats, including Pokémon like Talonflame, Keldeo, Mega Charizard X, and Mega Lopunny. It could also function as a Calm Mind sweeper, which was possible thanks to its immense bulk and access to Scald, which allowed Slowbro to burn Pokémon to take physical hits even better.
A lot of things changed for Slowbro, and not for the better. Toxapex gives Slowbro direct competition as a bulky Water-type, boasting more bulk and an overall better defensive typing. Toxapex also has access to Haze and Toxic Spikes, letting it offer more for its team than Slowbro can. The surge of Toxic Spikes, which was due to Toxapex, also indirectly crippled Slowbro. Ash-Greninja is a metagame-defining Water-type that Slowbro can't handle due to Ash-Greninja's Dark typing and Slowbro's relatively poor Special Defense stat. Gale Wings got nerfed in SM and ended up becoming Talonflame's fall, which meant Slowbro had one less Pokémon to wall. Choice Specs Keldeo was very popular in ORAS; unfortunately, thanks to the introduction of Toxapex, Keldeo got a lot worse, and again, Slowbro had one less Pokémon to care about. Z-Moves mean that Slowbro can be overwhelmed by Pokémon like Landorus-T and Garchomp that it's supposed to check. Slowbro now resides in NU.
