Leveraging high Sp.Atk, a full-attacker Mega Gengar with broad special coverage. Three types of attacks complement coverage, Protect mega-evolves safely before attacking.

Alternative Move Options

Sludge Bomb for added effect chance

Sludge Wave slot can take a higher proc-rate Sludge Bomb — recommended. Lower power but if poisoned, Focus Sasheven tanky walls become easier to break through.

Sub-weapon and utility swap candidates

Swap one sub-weapon slot Focus Blast from Icy Wind can hit Garchomp etc. on 4× weakness. Also Protect Destiny Bond — swapping eases handling of Sucker Punch.

Role of the Special Attacker Mega Gengar

The ability Shadow Tag traps favorable foes for KOs, pressing the opposing team is its role. High Speed STAB and rich sub-weapons trade with many foes, plus Protect safely mega-evolves, maximizing ability Shadow Tag.

Threats

Attackers that outspeed and hit weaknesses

Mega Gengar lacks bulk — faster attackers hitting weaknesses risk OHKO. This build only has attacks, so even when faster, priority Sucker Punch locks it down — beware.

The ability Shadow Tag locks the opponent in, combining Perish Song and Protect to reliably process one target build. Even near KO, Destiny Bonduse it to force a 1-for-1 trade.

Alternative Move Options

Swap Destiny Bond for multi-KO

• Substitute

Destiny Bond trades well with threats but limits multi-KOs. If targeting bulky → Substitute; pivot moves → Disable is recommended.

Role of the Perish Build

Catches favorable targets with Shadow Tag, reliably processing walls with Perish Song as a breaker — its role.Destiny BondCombined, can drag attackers and disrupt the field.

Threats

Pokémon with pivot moves

Shadow Tag is escaped by Volt Switch and U-turn etc. pivot moves bypass it.Chipping is low, pick targets carefully.

HP and Speed investment, Shadow Tag traps and finishes with status combos — a Mega Gengar build.Will-O-WispCuts physical firepower and racks chip, Protectcombined safely for doubled-power Hex hits.

Alternative Move Options

Protect → Destiny Bond or Focus Blast

• Protect

• Focus Blast

• Substitute

• Sludge Bomb

Protect — Destiny Bond forces trades, Focus Blast adds Dark coverage. Also, Will-O-Wispwith Substitute to improve staying power, or Sludge Wave → Sludge Bomb to raise poison chance.

Role of the Wisp-Hex

Uses high Speed and trapping ability to reliably catch and process favorable targets — attacker/control role. Shuts down physical attackers with STAB Sludge Wave or Hex precisely breaks the opposing field.

Threats

Attackers that outspeed

Mega Gengar lacks bulk — being outsped risks OHKO. Also, Wisp-Hex relies on Burn — Fire types negate it, leading to firepower deficits.

Focus Sash absorbs hits, and high Sp.Atk/Speed crush face-off opponents. Vs. unbeatable or unfavorable matchups, Sash + Destiny Bond reliably trades 1-for-1.

Alternative Move Options

Adapt per team

• Focus Blast

• Hex

• Icy Wind

Sash Gengar has high Sp.Atk/Speed and strong face-off performance. Hex after sleep-inducing, Icy Wind against faster foes, any move is strong — pick per team — recommended.

Sash Destiny Bond Role

From lead or revenge slot, broad coverage chips opponents as a face-off attacker. From high Speed, the attack-or-Destiny-Bond mind game forces processing of opposing aces/walls to disrupt the field — its role.

Threats

Weak to Pokémon piercing Sash

It struggles vs. Pokémon piercing Sash. Hippowdon and Tyranitar with Sand Stream then Earthquake KO it; Dragapult's Dragon Darts also KO. Be cautious.

With heavy HP/Spe EVs, after Mega Evolving, A build that fights mainly around the combo of the ability Shadow Tag and Perish Song Mega Gengar. With a Nature おくびょう its high Speed makes it easy to move first, and after blocking the opponent's switching it reliably forces them into fainting.

Alternative Move Options

Sludge Bomb also recommended

Sludge Bomb is also recommended instead of Disable. Running Sludge Bomb lets you hit Normal types that Shadow Ball cannot, and you can also target the weaknesses of Grass and Fairy types.

Role of the Doubles Perish Song Build

It blocks switching with the ability Shadow Tag and uses Perish Song to defeat the opponent.Attacks aimed at it Protect block them, while the opponent's effective hits Disable shut them down, buying turns as it plays out.

How to Use Perish Song

Perish Song is lifted when the opponent switches out, so use Mega Gengar's ability Shadow Tag to block switching. Also, by using Incineroar's Fake Out and Parting Shot, it becomes easier to keep Mega Gengar on the field until Perish Song knocks out the opponent. Teams That Use Mega Gengar

Threats

Weak to Ghost types and Pokémon with switching moves

Ghost types and Pokémon that use switching moves Shadow Tag and Perish Song are hard to defeat with this combo. Prepare ways other than Perish Song to defeat the opponent's Pokémon on your team.

Weak to Dark types

Dark types hit its weakness and also take Shadow Ball at half damage, making them troublesome.Protect and Disable to block incoming moves, while Perish Song or an ally's move to defeat them.

Max Sp.Atk/Spe EVs, with action-guarantee item and Speed manipulation — doubles support/special attacker Gengar. High Speed for spread attacks or order reversal creates board where allies can attack first — possible.

Alternative Move Options

Support moves are choices

Icy Wind slot can use other status. Trick Room hampers Gengar but Helping Hand can support team firepower.

Focus Blast also viable

Sludge Bomb slot can use Focus Blast. Focus Blast hits Shadow Ball-immune Normal/Dark/Steel for super-effective hits — good synergy.

Doubles Sash Trick Room Role

Item secures actions; Speed-lowering or order-reversing moves support team in doubles. Speed above key tier, create ally-friendly board — specialty.

Threats

Pokémon breaking Sash

Focus Sash is key for this Gengar, so Sandstorm chip or Scrappy Fake Out + Sucker Punch breaking Sash makes fighting hard.Also, DefiantDefiant users get Attack boost from Icy Wind — be careful.