Cyndaquil is small, bipedal Pokémon with bluish fur on top of its body, and a milky color on the underside. Although called the Fire Mouse Pokémon, Cyndaquil seems to be a composite of features from the echidna, seen in the flames erupting from its back, and the shrew, the general shape of its body. Its eyes are often closed, as it is still young. It has four red-colored spots on its back from which its flames erupt. It lacks claws on its forelimbs, but has a single claw on each hind foot.
Cyndaquil is capable of defending itself by using the fire on its back. The fire grows more powerful as the Cyndaquil becomes more angry or defensive. Cyndaquil is also able to expel obscuring smoke to lower the accuracy of its opponent.
Cyndaquil are usually timid, but its actual behavior depends on its personality. It tends to hide in most dangerous situations. Most Cyndaquil are inexperienced at first and don't know their strengths and weaknesses. If Cyndaquil is angry or surprised, such as from being attacked, it flares up its back for protection. Although its flames may burn vigorously in this emotional state, if Cyndaquil is tired the flames sputter fitfully with incomplete combustion.
Cyndaquil can adapt to many habitats, however, most are found in the care of Trainers, having been their starter Pokémon.
This Pokémon was unavailable prior to Generation I.