MGengar is great but he does face problems:
1) Priority and Multi Hit moves: The current meta lacks neither, and nearly all Gengar sets don't run bulk or enough of it to avoid death from things like Aegislash's Shadow Sneak, Talonflame Brave Bird, Azumarill's boosted AquaJet, etc. Multihit moves are found on many pokemon, for example MKangaskhan's EQ/Crunch.
2) Hazards: MGengar is susceptible to Hazards especially Stick Web which means you also need to support it.
3) Checks and Counters: Speciall Walls, Pranksters with status, Scarfers, bulky pokemon with STAB SE moves.
A lot has been said about the Perish Song trapping set, but you have to remember the following:
A) In order for it to work you need to Mega evolve first to activate the ability, which means the opponent can switch in to something that can handle it such as priority or counter. You can choose to stay and take out whatever he sends instead if you deem it worthy enough of sacrifice, but then you also have to outspeed it and use Perish Song on the switch. If you choose not to stay in, that means you have to build your team such that someone else can take the hit.
B) It is a sacrifice, the option to blow a hole or a chance to take down your sweepers main check/wall comes at a price, and even though does have Shadow Ball in it's set which is resisted only by Dark, in practice you will be pressured very quickly to use Perish song and stall immediately and end up taking only one pokemon most of the time.
Edit: Written by someone who actually runs Perish Song/Protect/Sub/Shadow Ball on his MegaGengar sets.
1) Priority and Multi Hit moves: The current meta lacks neither, and nearly all Gengar sets don't run bulk or enough of it to avoid death from things like Aegislash's Shadow Sneak, Talonflame Brave Bird, Azumarill's boosted AquaJet, etc. Multihit moves are found on many pokemon, for example MKangaskhan's EQ/Crunch.
2) Hazards: MGengar is susceptible to Hazards especially Stick Web which means you also need to support it.
3) Checks and Counters: Speciall Walls, Pranksters with status, Scarfers, bulky pokemon with STAB SE moves.
A lot has been said about the Perish Song trapping set, but you have to remember the following:
A) In order for it to work you need to Mega evolve first to activate the ability, which means the opponent can switch in to something that can handle it such as priority or counter. You can choose to stay and take out whatever he sends instead if you deem it worthy enough of sacrifice, but then you also have to outspeed it and use Perish Song on the switch. If you choose not to stay in, that means you have to build your team such that someone else can take the hit.
B) It is a sacrifice, the option to blow a hole or a chance to take down your sweepers main check/wall comes at a price, and even though does have Shadow Ball in it's set which is resisted only by Dark, in practice you will be pressured very quickly to use Perish song and stall immediately and end up taking only one pokemon most of the time.
Edit: Written by someone who actually runs Perish Song/Protect/Sub/Shadow Ball on his MegaGengar sets.
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