Wailmer

Despite having access to the strong Water Spout, Wailmer lacks the offensive presence to take advantage of it properly, as its Special Attack is low, and a lack of coverage options leaves it walled by a majority of threats in the metagame. Relying on Water Spout as an attacking move also means Wailmer is severely crippled by chip damage from entry hazards and priority moves, reducing its effectiveness. Its Speed allows many metagame threats such as Snivy and Gastly to outspeed it and KO it, as Wailmer isn't very bulky, which forces it to run Choice Scarf. Furthermore, its defensive stats leave it with mediocre bulk. Finally, Staryu and Frillish are better specially offensive Water-types, with the two former boasting better coverage, power, and Speed and the latter being a much better Water Spout user, which invalidates Wailmer's use on any serious team.