Poliwag

Poliwag (ニョロモ Nyoromo) is a -type Pokémon introduced in Generation I.

Poliwag evolves into Poliwhirl starting at level 25, which can then either evolve into Poliwrath by Water Stone, or Politoed by trade while holding a King's Rock.

Physical Appearance
It is so soft its organs are actually visible. It also has trouble walking on its feet due to it's lack of arms which cause it to be unbalanced.

Special Abilities
Poliwag will have 1 of 2 abilities either Damp where the foe can't use Selfdestruct or Explosion or Water Absorb where attacks heal 1/4 of Poliwag's health. With its light blue tail, it can swim very fast. It learns attacks such Bubble and Bubble Beam, and thats why it has a small mouth but the attacks are adorable.

Trivia
Poliwag's cry is same as Ditto's.