Tympole

Tympole may have nice coverage moves, but its horrid stats make it only somewhat usable in rain, which can only be set with Rain Dance. Even as a rain sweeper, it finds itself outclassed by Mantyke, whose better stats give it more opportunities to set Rain Dance and whose better coverage moves and power make it more threatening than Tympole. Rain Dance is also difficult to use, as Tympole has to find a turn to set up with its poor bulk, only to gain four turns of rain after. This makes other offensive Water-types that don't rely on Rain Dance like Staryu much more favorable to a team; Staryu can also provide utility by clearing entry hazards.