How do you Beat the Unown Tower?

[Bibo895]

Dear Everyone,

I am confused how to beat Unown Tower. I have 6 Gengars with Leftovers and still don't win. Should I use Drifblim which has 2.5 times the health of Gengar or continue with Gengar.

DeathBowser (2973750)

[Chiamon]

Use 6x Giratina at 1k

[Bibo895]

Well I don't have any giratina

[Verb]

Just swap the Gengars into Swamperts.

[ktb3100]

DarkDragonite ♀ 151
Dragonite ♀ 5
Dragonite ♂ 5
Electabuzz ♀ 9
Electivire ♂ 52
Exeggutor ♂ 5
Feebas ♂ 5
Feebas ♂ 5
Feebas ♀ 5
Gible ♂ 5
Gorebyss ♀ 5
ShinyMagikarp ♂ 152
Mewtwo 7
Mewtwo 9
Miltank ♀ 5
Minun ♂ 5
DarkMudkip ♀ 101
DarkMudkip ♂ 101
ShinyMudkip ♀ 101
ShinyMudkip ♂ 101
DarkMudkip ♂ 101
ShinyMudkip ♂ 101
Munchlax ♂ 5
NidoranM ♂ 5
Nincada ♀ 5
ShinyPikachu ♂ 177
Pinsir ♂ 5
Plusle ♀ 5
Regirock 24
Rotom 5
Rotom 5
Shelgon ♂ 150
Shieldon ♀ 59
ShinySnorlax ♂ 151
ShinySnorlax ♂ 154
ShinySnorlax ♂ 154
ShinySnorlax ♀ 151
ShinySnorlax ♂ 150
ShinySnorlax ♂ 150
Trapinch ♂ 5
Typhlosion ♂ 5
Umbreon ♀ 26
UnownX 5
UnownX 5
ShinyWailord ♂ 6

for the two?