Duet and Stella : Dark communion (Patreon)

A fusion of their two minds and abilities coming together. Duet is unable to use aura (just like Dew), so this makes her a great amplifier host for most ghost type pokemon, Stella seeing opportunity possessed Duet's body for herself boosting both her ghost and dark type moves, this also improves Duet's combat skills due to the fusion of both minds. Stella is aunt like to Duet