As a Ghost/Poison type, Mega Gengar has 4 weaknesses, 4 resistances and 2 immunities, more than the average Pokémon's 3.3 weaknesses. 4 other Pokémon share the Ghost/Poison typing.

Base stats

HP: 60
Attack: 65
Defense: 80
Sp. Atk: 170
Sp. Def: 95
Speed: 130
Total: 600

Mega Gengar has a base stat total of 600, higher than 90% of Pokémon. With Sp. Atk (170) well above Attack (65), it works best as a special attacker. A Speed of 130 beats 97% of Pokémon, so it outspeeds most opponents. With 60 HP, 80 Defense and 95 Sp. Def it is reasonably sturdy.

Mega Gengar's only ability is Shadow Tag.

How to beat Mega Gengar

Mega Gengar takes 2× damage from Ground, Ghost, Psychic and Dark moves, so lead with those.

Avoid relying on attacks it shrugs off: Normal and Fighting moves have no effect on it and Poison, Bug, Grass and Fairy moves are resisted.

Good counters: Tyranitar hits for 2× with Dark-type STAB and resists its Ghost and Poison moves. Ting-Lu hits for 2× with Dark-type STAB and resists its Ghost and Poison moves. Bloodmoon Ursaluna hits for 2× with Ground-type STAB and is immune to Mega Gengar's Ghost moves and resists its Poison moves.