As someone who has played water extensively since the start, these are my thoughts:
(1) Dondonzo -> S
This fish is just ridiculous. Any Pokémon that can single-handedly bail a player out of a losing situation deserves the ultimate ranking. Invest some Sp.Def and nothing kills her without dying first after she secures a Curse or two
(2) Toxapex-> A
She got nerfed badly this generation without Knock Off and the ability to fish for burns. Toxapex is still not useless, though, as she still can set Toxic
Spikes, Haze, and just being hard as fuck to kill
(3) Azumarill -> A
Sap Sipper is a godsend against powerhouses like Breloom. Without Azumarill, water teams get completely wrecked by the mushroom. I’m not even gonna bother saying anything about grass teams
(1) Dondonzo -> S
This fish is just ridiculous. Any Pokémon that can single-handedly bail a player out of a losing situation deserves the ultimate ranking. Invest some Sp.Def and nothing kills her without dying first after she secures a Curse or two
(2) Toxapex-> A
She got nerfed badly this generation without Knock Off and the ability to fish for burns. Toxapex is still not useless, though, as she still can set Toxic
Spikes, Haze, and just being hard as fuck to kill
(3) Azumarill -> A
Sap Sipper is a godsend against powerhouses like Breloom. Without Azumarill, water teams get completely wrecked by the mushroom. I’m not even gonna bother saying anything about grass teams