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Mega Gengar

Ghost · Poison · 600 BST · Gengarite
Regulation M-B legal · 6.4% usage
Mega Gengar
Base stats before and after Mega Evolution.
Stat Base Mega Relative size Change
HP 60 60 —
Attack 65 65 —
Defense 60 80 +20
Sp. Atk 130 170 +40
Sp. Def 75 95 +20
Speed 110 130 +20
Total 500 600 +100
Ladder

Used by 6.4% of Regulation M-B teams, 25 of 277 Pokémon on the ladder.

Moves

Protect 99.6% · Shadow Ball 98.4% · Sludge Bomb 83.5% · Perish Song 55.5% · Substitute 33.9% · Disable 19%

Ability

Shadow Tag 100%

Spread

The most common is Modest with 240 HP, 8 Defense, 8 Sp. Atk, 224 Sp. Def and 48 Speed, on 17% of them.

Taking damage

×4
nothing
both types weak
×2
DarkGhostGroundPsychic
super effective
×½
FairyGrass
resisted
×¼
BugPoison
doubly resisted
×0
FightingNormal
no effect

Dealing damage

×2
FairyGhostGrassPsychic
your STAB hits these
×½
nothing
these wall your STAB

What Mega Evolution changes

Gengar, number 94 in the National Dex and a Kanto Pokémon, holds Gengarite to become Mega Gengar, taking its total from 500 to 600. The biggest single gain is 40 Sp. Atk, followed by 20 Defense. Nothing goes down — HP and Attack stay exactly where they were.

The typing does not change — it is Ghost and Poison before and after — so the Mega is the same defensive problem as the base form, only bigger. Mega Evolving replaces Cursed Body with Shadow Tag.

What gets through

As Ghost and Poison, 4 of the eighteen attacking types get through for extra damage. It resists 4 and is outright immune to 2. The full board is above; the short version is that the types listed under ×2 and ×4 are the ones worth planning around.

On the Regulation M-B ladder

Mega Gengar is played on 6.4% of teams in the Regulation M-B VGC ladder, which puts it 25th of the 277 Pokémon with enough games to measure. The move almost every one of them carries is Protect at 99.6%. The Champions module tiers it Uber.

Those figures come from Smogon's published usage statistics rather than from anything measured here, and they describe what the ladder plays, not what is strongest.

What threatens it

Smogon publishes no head-to-head checks-and-counters data for doubles formats, so this list is computed, not measured: these are the most-played Regulation M-B Pokémon carrying a damaging move of a type Mega Gengar takes extra damage from.

Where it sits among the Megas

Of the 93 Mega forms in the dex, Mega Gengar is 49th by base stat total. Its best stat is Sp. Atk at 170, which is 7th among Megas; its worst is HP at 60, 84th. No other Mega Evolution has the Ghost and Poison typing, so this matchup board is unique to it. The unevolved Gengar is itself on 0.30% of teams.

Putting it on a team

A Mega slot is a commitment: the stone occupies the held item, so whatever Mega Gengar would have wanted from an item, it does not get. Drop it into the team builder to see what the rest of the six then have to cover, or take it to the damage calculator to find out whether those 170 points of Special Attack actually change a knockout.

Where this goes next

Build

Seat Mega Gengar in the team builder and the strip fills with everything the other five still have to answer for.

Core

Open the six the ladder actually plays — Mega Gengar beside Incineroar, Politoed, Ninetales-Alola, Swampert-Mega and Archaludon, the five it shares a Regulation M-B team with most often.

Base form

Gengar before it Mega Evolves, with its own move pool, ladder set and matchups.

Damage

Roll its Special Attack of 170 against any defender, spread and item, using Smogon's own engine.