You need to get rid of all the moves that make you recharge, As I would say they are all pretty bad,
For gengar, Sludge bomb is pretty useless, HP Ice would probably help more.
Member of Crystalline
Start of turn 1
Rotom-W used Trick!
Rotom-W switched items with the foe's Shedinja!
Rotom-W obtained one Toxic Orb!
The foe's Shedinja obtained one Choice Scarf!
The foe's Shedinja used Trick!
The foe's Shedinja switched items with Rotom-W!
The foe's Shedinja obtained one Toxic Orb!
Rotom-W obtained one Choice Scarf!