High risk, high reward with Gengar. The offense is outstanding but the bulk won't survive much — 60 base HP is the weak link. Normal and Fighting moves can't touch it, which offsets the 4 weaknesses somewhat. Known as the Shadow Pokemon.
The stat budget goes to damage. Sp. Atk and Speed carry the offense, HP doesn't even come close. A Shadow Pokemon on a 1.06M XP medium-slow curve, worth 3 Sp. Atk EVs per KO.
It can pass through other dimensions and can appear anywhere. It caused a stir one time when it stuck just one leg out of a wall.
Gengar Weakness
GoodType-wise, Gengar takes extra damage from Ground, Psychic, Ghost, and Dark. Normal and Fighting moves do nothing thanks to a full immunity. 4 resistances help offset the weaknesses. At base 110 Speed, Gengar outspeeds most threats and doesn't need to tank what it can outrun.
Getting Gengar requires a trade, not just grinding levels. The chain starts at Gastly. Breed this form to get Gastly eggs (average hatch time). Sp.Def grew the most through evolution (+40 over Gastly), and Gengar peaks at 500 total stats.
How to Evolve
Breed with Gengar to get Gastly eggs easily from the Indeterminate egg group.
utility options gives Gengar answers even while choice-locked. Choice Scarf provides speed patching through item lock, and max Sp. Atk and Speed EVs with Cursedbody mean every prediction that lands hits hard.
Best Build
Let's Go Pikachu & Eevee uses different battle mechanics.
Competitive build content is not applicable for this game. Select a main series game for builds.
Leveling does the heavy lifting. Gengar picks up Dream Eater and Foul Play along the way, building toward a complete offensive set. TMs add coverage across 9 types, but the foundation's already strong by then.
Level-Up Moves
TM Moves
Egg Moves
Tutor Moves
Gengar's 3-stage chain starts with Gastly, which appears at solid rates in the locations below. Level through 3 stages while you find a trade partner. Everything except the trade step is solo.
How to Obtain Gengar in Let's Go Pikachu & Eevee
Gastly is your first catch on the way to Gengar. You'll find walking encounters from Lv. 27-32 across 16 total spots in the chain.
Step 1Catch GastlyEFFORTLESSPokémon Tower - 1FLet's Go EeveeGrassLv.27-3275%MidBuildingEFFORTLESSPokémon Tower - 1FLet's Go PikachuGrassLv.27-3275%MidBuildingEFFORTLESSPokémon Tower - 2FLet's Go EeveeGrassLv.27-3275%MidBuildingEFFORTLESSPokémon Tower - 2FLet's Go PikachuGrassLv.27-3275%MidBuildingEFFORTLESSPokémon Tower - 3FLet's Go PikachuGrassLv.27-3270%MidBuildingEFFORTLESSPokémon Tower - 3FLet's Go EeveeGrassLv.27-3270%MidBuildingEFFORTLESSPokémon Tower - 4FLet's Go PikachuGrassLv.27-3260%MidBuildingEFFORTLESSPokémon Tower - 4FLet's Go EeveeGrassLv.27-3260%MidBuilding
Step 2Catch or Evolve HaunterEASYPokémon Tower - 4FLet's Go PikachuGrassLv.27-3220%MidBuildingEASYPokémon Tower - 4FLet's Go EeveeGrassLv.27-3220%MidBuildingMODERATEPokémon Tower - 3FLet's Go PikachuGrassLv.27-3210%MidBuildingMODERATEPokémon Tower - 3FLet's Go EeveeGrassLv.27-3210%MidBuildingCHALLENGINGPokémon Tower - 1FLet's Go EeveeGrassLv.27-325%MidBuildingCHALLENGINGPokémon Tower - 1FLet's Go PikachuGrassLv.27-325%MidBuildingCHALLENGINGPokémon Tower - 2FLet's Go EeveeGrassLv.27-325%MidBuildingCHALLENGINGPokémon Tower - 2FLet's Go PikachuGrassLv.27-325%MidBuildingor evolve from Gastly (Step 1)
Step 3Gengar ✓
We rate Gengar A-Tier — a strong competitive pick. At 500 BST, it fits the sweeper role. Base 130 Sp. Atk stands out.
Gengar's biggest threats include Golem (Ground), Starmie (Psychic), and Misdreavus (Ghost), all carrying super-effective STAB moves. Dark-type attackers are also a problem. Gengar's base 110 Speed lets it outpace many threats and strike first, which matters more than trying to tank hits.
Cursed Body is the go-to ability for Gengar. It has a 30% chance of Disabling any move that hits the Pokémon. It's Gengar's only ability.
Base 110 Speed lets it outrun most of the field. On offense, Gengar is a special attacker with base 130 Sp. Atk. Best used as a sweeper.
Gengar appears in 22 games, including Yellow, Red & Blue, and Gold & Silver.
Since debuting in Red & Blue, Gengar has appeared in 22 titles over 9 generations. Along the way, it received a Mega form in Generation 7 and a Gigantamax form in Generation 8, keeping it relevant across different competitive metas.
- Gen IY
Yellow - Gen IRBDebut

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 VBW

Black & White - Gen VB2W2

Black 2 & White 2 - Gen VIXY

X & Y - Gen VIORASMega

Omega Ruby & Alpha Sapphire - Gen VIIUSUM

Ultra Sun & Ultra Moon - Gen VIISM

Sun & Moon - Gen VIILGPE

Let's Go Pikachu & Eevee - Gen VIIISwShGigantamax

Sword & Shield - Gen VIIIPLA
Legends: Arceus - Gen VIIIBDSP

Brilliant Diamond & Shining Pearl - Gen IXSV

Scarlet & Violet - Gen IXLZA
Legends: Z-A