Zweilous is technically a pre-evolution of Hydreigon, but it holds its own in formats where Eviolite is allowed. Psychic moves can't touch it, which offsets the 4 weaknesses somewhat. Known as the Hostile Pokemon. Flexible enough to run physical or special sets.
Attack and HP carry most of Zweilous's stat budget. Speed's the obvious dump stat. Tough to catch and yields 2 Attack EVs. Follows a slow 1.25M XP grind.
After it has eaten up all the food in its territory, it moves to another area. Its two heads do not get along.
Since their two heads do not get along and compete with each other for food, they always eat too much.
Zweilous Weakness
GoodType-wise, Zweilous takes extra damage from Ice, Fighting, Bug, and Dragon. Psychic moves do nothing thanks to a full immunity. With 6 resistances, the defensive profile is strong.
- Fairy type does not exist — Dragon has fewer checks
- Physical / Special split now per-move (introduced Gen IV)
Partway through Deino's chain. Zweilous still has another evolution ahead before reaching Hydreigon. For breeding, takes forever to hatch with a decent partner pool via one egg group. HP has grown the most so far (+20), but there's still another 180 stats to gain in the final evolution.
How to Evolve
Breed with Zweilous to get Deino eggs using 39 partners from the Dragon egg group. Notable egg moves include Assurance, Astonish, Dark Pulse and 7 more.
Best Build
No build content available for this Pokemon in Gen 5.
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The egg pool carries weight here. Assurance and Astonish aren't available any other way for Zweilous, and they meaningfully change what it threatens. Stack those on top of Draco Meteor and Outrage for solid options.
Level-Up Moves
TM Moves
Egg Moves
Tutor Moves
Reminder Moves
No wild encounters for Zweilous. The 2-stage line runs through Deino, which you can catch at decent rates from the locations below. Evolve at level 50 once you've got the levels.
How to Obtain Zweilous in Black & White
The path to Zweilous starts with Deino at Lv. 38-39 via walking encounters. 1 catchable stage total, with locations listed for each one below.
Step 1Catch DeinoEASYVictory Road - 1FBlackGrassLv.38-39UncommonLateCaveAnyEASYVictory Road - 1FWhiteGrassLv.38-39UncommonLateCaveAnyEASYVictory Road - 3FBlackGrassLv.38-39UncommonLateCaveAnyEASYVictory Road - 3FWhiteGrassLv.38-39UncommonLateCaveAny
Step 2Zweilous ✓
Zweilous is meant to evolve into Hydreigon. At 420 BST, the stats aren't there for competitive play yet. Pre-evolution Pokemon rarely hold up against fully evolved threats.
Hustle is the go-to ability for Zweilous. It strengthens physical moves to inflict 1.5× damage, but decreases their accuracy to 0.8×. It's Zweilous's only ability.
At base 58 Speed, it won't be moving first often. On offense, Zweilous is a physical attacker with base 85 Attack. Defensively? Enough bulk to take a hit or two.
Zweilous appears in 8 games, including Black & White, Black 2 & White 2, and X & Y.
Zweilous joined the series in Black & White and has been available in 8 titles so far. With 5 generations of appearances, it's established itself despite the later start.
- Gen IY
Yellow - Gen IRB
Red & Blue - Gen IIGS
Gold & Silver - Gen IIC
Crystal - Gen IIIRS
Ruby & Sapphire - Gen IIIFRLG
FireRed & LeafGreen - Gen IIIE
Emerald - Gen IVPt
Platinum - Gen IVHGSS
HeartGold & SoulSilver - Gen IVDP
Diamond & Pearl - Gen VBWDebut
Black & White - Gen VB2W2
Black 2 & White 2 - Gen VIXY
X & Y - Gen VIORAS
Omega Ruby & Alpha Sapphire - Gen VIIUSUM
Ultra Sun & Ultra Moon - Gen VIISM
Sun & Moon - Gen VIILGPE
Let's Go Pikachu & Eevee - Gen VIIISwSh
Sword & Shield - Gen VIIIPLA
Legends: Arceus - Gen VIIIBDSP
Brilliant Diamond & Shining Pearl - Gen IXSV
Scarlet & Violet - Gen IXLZA
Legends: Z-A