3v3 team with Alakazam, Gengar, and ???

[Goku Uzumaki]

Gengar and Alakazam are my favorite pokemon, what would be a good pokemon to add to my team's third slot that would have good synergy with Gengar and Alakzam?

Right now I have:

Alakazam
Psychic
Shadow ball
Focus blast
Calm mind

Gengar
Sludge wave
Destiny bond
Focus blast
Shadow ball


(This is my first new thread I apologize if its in the wrong place)