I agree with both of you. Dark Void is extremerly powerfull on doubles. Focus sash smeargle always goes with a fake out user to ensure the dark void. I mean, who goes with two prankster users on a team ? Lum berry , and magic bounce are the only real way to deal with dark void, but theres two pokemon on the field, meaning your oponent can smash you with the other pokemon ( usually Kangaskahn) and nobody usss heal bell natural cure and aromatherapy on VGC. Dark Void is so broken, even Wide Guard can't stop it, something i can't understand.
Perish Song is extremely broken, but a little bit predictable. I mean, when you see Gengar Politoed Gothitelle and Scrafty you know what to expect. I agree with
ProjectTitan313 on the few ansewers to deal with perish song, but u know that gengar will do :tunr 1 persih song, turn 2 protect, turn 3 attack or swicht out. You can take that for your advantatge. What i say is, persish song needs a whole team build around this strategy, Dark Void no. So i belive the best option will be "nerf" perish song with something like a clause that make it no compatible with shadow tag or with another persih song user. And ban Dark Void