Loudred is a purple, bipedal Pokémon with a square build. It has a large mouth with yellow lips and peg-like teeth in each corner. When its mouth is open, its large tongue and throat are visible. Above its prominent mouth is a stubby nose. On top of its head are two short stalks that support its circular ears. The inside of its ears have alternating black and purple rings, but there is only a single black ring on the back. There are yellow stripes on its back in a pattern that resembles sound waves. It has arms with three fingers and short legs with two peg-like toes. On the sole of each foot is a yellow circle.
Loudred is able to shout at high volumes by inhaling, then exhaling using powerful stomach muscles. Additionally, its round ears serve as loudspeakers and it will stomp its feet to build power. Its powerful voice can tip trucks and splinter wooden houses, but it will be temporarily deaf when it finishes shouting. Loudred can be found in caves.
In the main series
Major appearances
Loudred debuted in A Hole Lotta Trouble and appeared multiple times while Ash and his friends were on Dewford Island until A Three Team Scheme!.
A Loudred appeared in the Pokémon Mystery Dungeon: Explorers of Time & Darkness and Pokémon Mystery Dungeon: Explorers of Sky - Beyond Time & Darkness as a member of the Wigglytuff Guild.
Other
A Loudred appeared in Gotta Dance!!. It would keep showing up whenever the Poké-Baton was activated, along with a Ludicolo. Unlike Ludicolo, who seemingly disappeared into thin air every time the Poké-Baton was deactivated, Loudred would stare blankly for a brief time before finally leaving. When the Poké-Baton finally shorted out, Loudred went mad.
A Loudred appeared in Exploud and Clear, under the ownership of Guy. When Ash challenged Guy to a Pokémon battle, both Loudred and Treecko evolved at the same time.
A Loudred appeared in Rough, Tough Jigglypuff, where Mitch Mitchum had caught it because he thought that the Big Voice Pokémon's Ability to be immune to sound-based moves would help him to catch a Jigglypuff for his daughter's birthday.
A Loudred appeared in the Hoopa's Surprise Ring Adventures short Wake Up, where it was among the Pokémon summoned by Hoopa to use their sound-based attacks to wake Ash, but to no avail.
Three Loudred appeared in JN022, where they had a dance battle with a Lombre and its two subordinate Zigzagoon over territory. However, Goh's Raboot intervened and help Lombre's group win the dance battle.
Minor appearances
A Loudred appeared in a flashback in Delcatty Got Your Tongue.
A Loudred appeared in PK13.
A Coordinator's Loudred appeared in Lessons in Lilycove.
A Loudred appeared in a fantasy in The Right Place and the Right Mime.
A Trainer's Loudred appeared in Off the Unbeaten Path, where it was participating in the Pokémon Orienteering competition.
A Coordinator's Loudred appeared in What I Did for Love!.
A Loudred appeared in Jessie's fantasy in Three Jynx and a Baby!.
A Coordinator's Loudred appeared in Thinning the Hoard!.
A Loudred appeared in a fantasy in Pinch Healing!.
A Loudred appeared in Camping It Up!.
Pokédex entries
Episode
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Pokémon
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Source
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Entry
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AG026
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Loudred
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Ash's Pokédex
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Loudred, the Big Voice Pokémon. Loudred has a voice powerful enough to blast a wooden house into splinters. Its round ears act as speakers.
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Episode
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Pokémon
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Source
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Entry
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AG138
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Loudred
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May's Pokédex
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Loudred, the Big Voice Pokémon. Loudred is able to stomp its feet and emit Supersonic attack so powerful, they can blow entire houses away.
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In Pokémon Generations
A Loudred appeared in The Scoop, where it was shown working at TV Mauville.