Bag Poké Ball SV Sprite.png
Ruby's Swampert
Debuts in Trying to Trounce Torchic
Caught at Route 101
Evolves in Tripped Up by Torkoal
Master Class with Masquerain
Gender Male
Ability Torrent
Nature Relaxed
Current location With Ruby
HOME258.png HOME259.png HOME260.png
This Pokémon spent 17 chapters as Mudkip and 31 chapters as Marshtomp.

Mumu (Japanese: ZUZU), known as Zuzu in Chuang Yi's translations, is a Swampert that Ruby owns in Pokémon Adventures and his fourth Pokémon overall. Ruby was given him from Professor Birch. He is at level 71, his Characteristic is that he "likes to relax", and he is used in Tough Contests.


Ruby & Sapphire arc

Mumu meeting Ruby

Mumu first appeared as a Mudkip in Trying to Trounce Torchic, as one of the two Pokémon that was in Professor Birch's bag. When Ruby was rescued by Sapphire from a pack of wild Mightyena, she took him to her Secret Base. He thought she was a Pokémon of some sort, and was shocked to the spine when she started talking. The two ended up getting into a fight after he ordered Nana to Bite the supposed "Pokémon." Still holding his own Pokémon from fighting back, he phoned Professor Birch on the Pokégear that was in his bag, and was told to choose the "blue Pokémon," which he then chose over the "green one". However, against Sapphire's well-trained Chic, he was no match, even with his type advantage. He later nicknamed him "Mumu" after he defeated a wild Dustox and decided he would be best for the Tough category of Pokémon Contests.

In Tripped Up by Torkoal, Mumu evolved into Marshtomp, gaining the awe of the Pokémon Fan Club Chairman, who also adored Nana and Kiki. He tried to help Ruby enlist in the Contests there, but with no Hoenn Contest Pass, he wasn't accepted. Instead, the two ended up being dragged into a mire when three Magma Admins kidnapped the two along with Captain Stern. When Ruby awakened Mumu popped out of his Poké Ball to help free him, but to no avail. Upon realizing that the one interrogating Stern for information now was in cahoots with Tabitha and Courtney, who had attacked him and Sapphire before, Ruby used his Pokéblock-making skills to lure Blaise's Slugma into the Submarine they were planning to steal. Mumu managed to counter Slugma's fire attacks, but soon fell to Blaise's illusions. After overcoming it, he attacked with Earthquake, allowing the two to reach the escape pod.

Mumu earning the Super Ribbon

In Hanging Around With Slaking I, Mumu battled Ruby's father, Norman. After Nana and Kiki were defeated due to Norman knowing how they attacked it was revealed that they were a distraction for Mumu to set up a Mud Shot attack, which landed a direct hit after shooting through some pipes. Norman quickly counters with Vigoroth and it seems the two were evenly matched. Ruby soon attempts to fire Mumu's high-powered Mud Shot, but it is stopped by Mr. Stone's Castform's Sunny Day.

In It's Absol-lutely a Bad Omen, Mumu advanced Ruby through the Normal Rank of the Tough Contest. In Going to Eleven with Loudred and Exploud I, Mumu is used alongside Ruby's other Pokémon to battle against Courtney and her Ninetales. Although Ruby had a five-to-one advantage, his team was beaten due to Ninetales having control of nine different fireballs.

Mumu battling Archie and Maxie

In I More Than Like You, Luvdisc I, Mumu advanced Ruby through the Super Rank of the Tough Contest. After the contest Mumu is used in Ruby's battle against Wallace alongside the rest of his team, bar Feefee, and loses.

In Master Class with Masquerain, Mumu evolved into Swampert. Soon after Mumu advanced Ruby through the Hyper Rank of the Tough Contest.

In The Beginning of the End with Kyogre & Groudon X, Mumu, alongside Ruby and Sapphire's other Pokémon, battled Archie and Maxie. He and Chic attempted to deliver a decisive blow, but failed to do any real damage. In The Beginning of the End with Kyogre & Groudon XIV, Mumu and Chic attack the meteor fragment coming from Archie and Maxie, which sends a powerful blast of energy out. The energy hits Maxie and Archie's foreheads, turning them back to normal and stops the power of the Red and Blue Orbs.

In It All Ends Now VIII, Mumu battled alongside the rest of Ruby and Sapphire's Pokémon against Maxie and Archie. Later that day, Mumu is shown to have won the Master Rank of the Tough Contest, wearing a Yellow Scarf.

Emerald arc

Mumu training to learn Hydro Cannon

In Cunning Kirlia, Mumu advanced Ruby through the Battle Dome. Despite being one of his three options to fight against Emerald he was not used.

In Facing Gulpin Is Hard to Swallow, Mumu helped Ruby, Sapphire, Emerald, and Noland advance through the Battle Tower to reach Guile Hideout.

In The Final Battle III, Mumu is taught Hydro Cannon. He was soon used alongside Blasty and Silver's Feraligatr to attack with Hydro Cannon to help destroy Guile Hideout's fake Kyogre.

Omega Ruby & Alpha Sapphire arc

In Salamence Evolves, Mumu, alongside Chic and Sceptile, trained under Ultima in order to fully master the ultimate moves. The training was issued by Steven Stone and Mr. Stone as part of a plan dedicated to preventing a giant meteoroid from crashing into the planet. With Ruby having business elsewhere, Steven trained Mumu in his Trainer's stead. When Ruby returned in PS604 to stop the attack Zinnia lead on the Sea Mauville, he Mega Evolved Mumu for the first time and used him to battle Zinnia's Goodra.

Personality and characteristics

Mumu's Swampertite
Mumu and Ruby

Mumu was noted in his debut appearance for being less coordinated, swift, and graceful compared to the rest of Ruby's team at the time; and it habitually left a trail of mucus from his nose. Despite this, Mumu quickly won Ruby over with his resourcefulness and ability to use his fin's enhanced senses to detect enemies. As Ruby's Pokémon Contest representative for the Toughness category, Mumu exhibits great fortitude and power in contests and battle, becoming Ruby's main powerhouse as the chapter developed. After evolving, many of Mumu's clumsier traits as a Mudkip seem to have faded.


See also: Mega Evolution
As a Mudkip As a Marshtomp As a Mega Swampert

Moves used

Using Mud Shot
Using Rock Smash
as a Marshtomp
Move First Used In
Water Gun Trying to Trounce Torchic
Mud-Slap Tongue-Tied Kecleon
Tackle Unknown*
Earthquake Slugging It Out with Slugma II
Mud Shot Hanging Around With Slaking I
Rock Smash What Would You Do for a Whismur?
Bide I More Than Like You, Luvdisc I
Muddy Water The Beginning of the End with Kyogre & Groudon X
Mud Sport The Beginning of the End with Kyogre & Groudon XI
Endeavor It All Ends Now II
Hydro Cannon  The Final Battle VIII*
Hammer Arm  PS605
A shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.


  • Although Mumu doesn't evolve into his final stage until Volume 19, the cover art depicts him as a Swampert along with Sapphire's Chic (which by then was already a Blaziken) the volume prior. This might be due to the fact that before being released in volume form, few to several rounds, even within the same chapter, may be left uncollected, and so the fans were expected to be aware of his evolution already, which happened mere chapters after the end of this volume. Alternatively, it may just be a result of the fact that Mumu and Chic were always seen in the same evolution stage when placed in a volume cover together, just as Exbo, Feraligatr, and Megaree were in the covers for the Gold, Silver & Crystal arc.
  • Mumu's Contest call is, "Regardless of the effects of time, the toughness that this body encompasses never changes. Boiling with raging Torrent, this is the Pokémon Swampert—Mumu!"
  • Mumu is the only male Pokémon that Ruby currently owns.


Language Name Origin
Japanese ZUZU Zuzu From ミズゴロウ Mizugorou (Mudkip)
English Mumu (VIZ Media) From Mudkip
Zuzu (Chuang Yi) Same as his Japanese name
French Boubou From Gobou (Mudkip)
German Pexi From Sumpex (Swampert)
Spanish, Brazilian
Mumu From Mudkip
Italian Zuzu Same as his Japanese name
Chinese (Mandarin) ZUZU Zuzu Same as his Japanese name
Korean 주주 Zuzu Transliteration of his Japanese name
Vietnamese Zuzu Transliteration of his Japanese name

Related articles

For more information on this Pokémon's species, see Mudkip, Marshtomp, and Swampert.

  This article is part of Project Manga, a Bulbapedia project that aims to write comprehensive articles on each series of Pokémon manga.