Tympole

1. Tympole is a round, tadpole-like Pokémon with a tan, circular face. It has large, oval, black eyes, a wide mouth with down-turned corners, and black eyebrows in the shape of quarter notes. Its spherical body is black with no visible limbs. Instead, it has two black-and-blue ringed half-spheres on either side of its head.
2. Basically a Tynamo rip-off, despite being introduced in the same game. Literally a sperm Pokémon, it evolves into a ugly frog.

A weak Pokémon from the Gen5 games is Tympole.