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, splinter wooden houses, and blow away its opponents, but it will be temporarily deaf when it finishes shouting. Loudred can be found in caves.
In Gotta Dance!!, a Loudred 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.
In Exploud and Clear, Guy owns a Loudred. When Ash challenged Guy to a Pokémon battle, both Loudred and Treecko evolved at the same time.
Loudred seems to be based on a boombox (a portable music system that can play music at a relatively high volume) with ears resembling loudspeakers. It may also be based on a megaphone or an electronic amplifier since its tail resembles an input/output port. The curved yellow markings on its back resemble the stylized sound waves on a volume icon.
Loudred may be a combination of loud and dread (great fear; referring to how loud noises can be startling).
Dogohmb may be a combination of 怒号 dogō (angry roar, bellow) and bomb.