Mudkip is a small, amphibious, quadrupedal Pokémon. It has a blue body with a light-blue underside. Mudkip has a large head with a blue fin on top and a light-blue tail fin. It has black, beady eyes and orange, star-shaped gills on its cheeks. By using the fin on its head, Mudkip can detect changes in air and water currents as well as bodies of water. Its fin can also point in a certain direction, as seen in the anime. Mudkip is capable of moving or crushing boulders larger than itself. Its large tail fin provides powerful acceleration to propel it through the water.
According to its Pokémon Ranger browser entry, Mudkip is a very docile Pokémon. Mudkip is more commonly found in captivity, though it can be found in swamps and other wetlands. In the wild, it sleeps by burying itself in the soil at the water's edge.
Brock has a Marshtomp that he caught as a Mudkip in A Mudkip Mission. Mudkip Eggs were seen in the episode when Old Man Swamp offered to let Brock see one hatch, and Brock accepted his offer with enthusiasm. Brock's Mudkip later evolved into a Marshtomp in A Chip Off the Old Brock.
Other
In Get the Show on the Road, May was asked to use a Pokémon to attack some Poochyena, she summoned a Mudkip, only for it to use Water Gun on her. Later, when May was asked to pick her starter Pokémon, she didn't pick Mudkip, remembering the time when it refused to do what she had asked.
In A Six Pack Attack!, a Mudkip belonging to Professor Birch was featured along with the other starters. They were being admired by Max and May when Team Rocket captured them along with the other Hoenn and Kanto starters. Max found them and told Mudkip and Squirtle to cool the bars with Water Gun, which eventually freed them. It then helped send Team Rocket blasting off.
In a flashback in Abandon Ship!, Tommy owned a Mudkip. It was revealed to have evolved into a Marshtomp and then into a Swampert after it was accidentally abandoned aboard a ship.
Mudkip, the Mud Fish Pokémon. Mudkip uses the sensitive radar receptors on its headfin to determine what's going on around it. In a pinch, it can brandish enough power to crush rocks.
In the Pokémon Omega Ruby and Alpha Sapphire Animated Trailer
In Trying to Trounce Torchic, when Ruby was attacked by Sapphire's Torchic, Professor Birch told him to look in his briefcase, to pick up the Poké Ball with a blue Pokémon and to throw it. The Poké Ball released a Mudkip and he nicknamed him Mumu. In the beginning, Ruby was disappointed with him because he wasn't as attractive as his other Pokémon and he couldn't participate in any Pokémon Contest. He tried with different conditions and then decided that Tough Contests would be perfect for him. Mumu eventually evolved into a Marshtomp and then into a Swampert.
The fin on its head is like a sensitive radar. The fin is able to detect movements in the air and water. This Pokémon can determine the surroundings around it without using its eyes.*
The fin on Mudkip's head acts as highly sensitive radar. Using this fin to sense movements of water and air, this Pokémon can determine what is taking place around it without using its eyes.*
"A Mud Fish Pokémon. It has fins on its head and tail. The fin on its head acts like a radar dish to read its surroundings, and its tail fin increases its swimming speed. The gills on its cheeks allow it to move about in water. It's very strong for its size--it can even lift big boulders. It burrows into muddy watersides to sleep. Mudkip evolves into Marshtomp."
Game data
Pokédex entries
This Pokémon was unavailable prior to Generation III.
The fin on Mudkip's head acts as highly sensitive radar. Using this fin to sense movements of water and air, this Pokémon can determine what is taking place around it without using its eyes.
In water, Mudkip breathes using the gills on its cheeks. If it is faced with a tight situation in battle, this Pokémon will unleash its amazing power - it can crush rocks bigger than itself.
The fin on Mudkip's head acts as highly sensitive radar. Using this fin to sense movements of water and air, this Pokémon can determine what is taking place around it without using its eyes.
In water, Mudkip breathes using the gills on its cheeks. If it is faced with a tight situation in battle, this Pokémon will unleash its amazing power—it can crush rocks bigger than itself.
In a poll conducted by Nintendo of Europe, Mudkip was voted as the fans' favorite starter Pokémon, with Typhlosion and Blastoise close behind in second.
Mudkip is the subject of a popular Internet meme known as "So i herd u liek mudkipz?".