#0634 · Unova · Generation 5

Zweilous

Hostile Pokémon · Dark/Dragon-type

Zweilous is a Dark/Dragon-type Pokémon, the Hostile Pokémon, number 634 (#0634) in the National Pokédex. It was introduced in Generation 5 and comes from the Unova region. It is 1.4 m tall and weighs 50 kg.

Zweilous is the Hostile Pokémon, a two-headed Dark and Dragon type whose heads cannot stand each other. They compete over every scrap of food, so it overeats constantly and ends up stronger just from the arguing.

How to pronounce Zweilous

Zweilous is pronounced ZWY-lus. The capital letters show the stressed syllable.

Listen to Zweilous said out loud:

In Japanese it is ジヘッド (Dihead).

Hear every other name on the Pokémon pronunciation guide.

Lore

Biology

Zweilous is a dark blue quadruped, 1.4 m tall and 50 kg, with two heads on black-furred necks and two thin, pointed wings. Its forelegs are muscular and each foot has two claws, while the hind legs are less defined. It appears to have no eyes, though Bulbapedia says it is not known whether it is blind.

Behaviour

The two heads dislike each other and each has its own likes and dislikes. The Pokédex says whichever head eats more gets to be the leader, so Zweilous always eats too much and is scarred even without opponents. Scarlet's entry says that unless both heads get equal attention they start fighting out of jealousy. Once it has eaten everything in its territory it moves on, the heads bickering over which way to go.

Habitat

Bulbapedia says Zweilous generally makes its home in caves. In Scarlet it is found in Area Zero, Glaseado Mountain and North Province Area Two, and in 4 star Tera Raid Battles; Violet players need to trade for it.

Powers

Zweilous bites with Bite and Crunch, breathes Dragon Breath, and builds up to Dragon Pulse, Dragon Rush and Outrage. Its only Ability is Hustle. With HP 72, Attack 85 and Speed 58 it hits fairly hard but is slow.

Name origin

Zweilous may blend the German zwei ('two') with 'jealous', for its quarrelling heads, or 'zealous'. The Japanese name is Dihead (ジヘッド), perhaps di- or 二 ji ('two') and 'head'.

Design inspiration

Bulbapedia, citing Ken Sugimori's interviews in Nintendo Dream, says the Deino line was first meant to have tank features, was scrapped and was revived late in development, and the tread-like marks on Zweilous's underbelly are a leftover of that idea. Its two heads may also recall many-headed dragons and serpents such as the Lernaean Hydra.

Evolution notes

Zweilous evolves from Deino at level 50 and into Hydreigon at level 64.

In the games

In Black and White the only way to get a Zweilous is to evolve a Deino, while wild ones appear on Victory Road in Black 2, White 2, and X and Y. It is unobtainable in Legends: Z-A.

In the anime

Zweilous made its series debut in 'A Village Homecoming!', where Iris's friend Shannon raised two, and the older one evolved into Hydreigon. In 'Aiming for the Top Floor!', Ryuki's Zweilous easily beat Kiawe's Marowak.

Fun facts

• Zweilous has exactly 20 more base stat points than Deino in every stat.
• Bulbapedia notes that Zweilous shares its category, Hostile Pokémon, with the Red-Striped and Blue-Striped forms of Basculin.
• Bulbapedia suggests its Shiny colouring may be inspired by the green scales of Zmei Gorynych, a many-headed dragon of Slavic myth.

Sources: Bulbapedia: Zweilous (Pokémon) · Serebii: Zweilous (Scarlet/Violet Pokédex)

Base stats

• HP: 72
• Attack: 85
• Defense: 70
• Sp. Atk: 65
• Sp. Def: 70
• Speed: 58

Zweilous’s base stat total is 420. Its highest stat is Attack.

Type matchups

What is Zweilous weak to?

Zweilous takes extra damage from Fairy (4×), Ice (2×), Fighting (2×), Bug (2×), Dragon (2×) moves.

It resists Fire (½×), Water (½×), Electric (½×), Grass (½×), Ghost (½×), Dark (½×).

It is immune to Psychic moves.

Evolution

What does Zweilous evolve from?

Zweilous evolves from Deino at level 50.

How does Zweilous evolve?

Zweilous evolves into Hydreigon at level 64.

The whole family: Deino, Zweilous, Hydreigon.

Abilities

• Hustle: Strengthens physical moves to inflict 1.5× damage, but decreases their accuracy to 0.8×.

Moves

Moves Zweilous learns by level up in Scarlet / Violet

TM moves (36)

Zweilous can learn 36 moves from TMs in Scarlet / Violet: Take Down, Scary Face, Protect, Fire Fang, Thunder Fang, Ice Fang, Thief, Facade, Snarl, Dragon Tail, Endure, Sunny Day, Rain Dance, Zen Headbutt, Body Slam, Sleep Talk, Thunder Wave, Stomping Tantrum, Rest, Taunt, Dark Pulse, Substitute, Crunch, Dragon Pulse, Hyper Voice, Helping Hand, Earth Power, Nasty Plot, Outrage, Draco Meteor, Tera Blast, Roar, Spite, Lash Out, Psych Up, Dragon Cheer.

Egg moves (4), which Deino can hatch knowing:Astonish, Belch, Double Hit, Head Smash.

Breeding & training

• Gender: 50% male, 50% female.
• Egg groups: Dragon.
• Egg cycles: 40 (steps to hatch, Scarlet/Violet: 5,120).
• Catch rate: 45 out of 255.
• Base friendship (Gen 8 onward): 35.
• Growth rate: Slow (1,250,000 experience points to reach level 100).
• Defeating it gives 2 Attack effort values.
• Base experience yield: 147.

Pokédex entries

Their two heads will fight each other over a single piece of food. Zweilous are covered in scars even without battling others. (Shield)

While hunting for prey, Zweilous wanders its territory, its two heads often bickering over which way to go. (Sword)

After it has eaten up all the food in its territory, it moves to another area. Its two heads do not get along. (Black, Y, Alpha Sapphire)

The two heads do not get along. Whichever head eats more than the other gets to be the leader. (Black 2, White 2, X, Omega Ruby)

Since their two heads do not get along and compete with each other for food, they always eat too much. (White)

Names around the world

Trivia

• Taller than 68% of all Pokémon (1.4 m).
• Heavier than 66% of all Pokémon (50 kg).
• Base stat total 420, ranked #562 of 1,025.
• One of 5 Pokémon that are both Dark and Dragon.
• One of 170 blue Pokémon.
• Number 141 of 156 Pokémon introduced in Generation 5 (Unova).
• Part of an evolution family of 3 Pokémon.
• Can learn 49 different moves in Scarlet / Violet.
• Catch rate 45: about 5.9% per Poké Ball at full health.
• Appears in 5 distinct Pokédex entries.

Sources and fact-checking

• Stats, types, abilities, moves, evolutions, forms and Pokédex entries: PokéAPI open game data.
• Lore: written by pokee.si in our own words, researched from Bulbapedia: Zweilous (Pokémon), Serebii: Zweilous (Scarlet/Violet Pokédex).
• Pronunciation (ZWY-lus): no English source says it out loud, so it is our best guess from the parts of the name.

Last checked: 20 October 2026. Every sentence of the lore was checked against Bulbapedia, Serebii and the game data.

Explore

Dark-type Pokémon · Dragon-type Pokémon · Dark/Dragon weaknesses and matchups · Unova region guide · Hustle ability · Compare Zweilous · Full Pokédex · Type chart · All moves

Browse similar Pokémon

Gen 5 Dark-type Pokémon · Gen 5 Dragon-type Pokémon · Gen 5 Pokémon list · Blue Pokémon list · Dragon egg group · Pokémon that start with Z · Dragon-like Pokémon

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