Here's an ru duo.
Evs. 252 attack, 4 defence, 252 speed
Evs 252 hp, 252 sp. attack, 4 speed
They completely destroy together. Sigyliph uses reflect and light screen to protect them and allow absol to take hits. Then often the screend are up I get up cosmic powers to get massive defences. Then absol and sigyliph have an easy sweep. If a dark type threatens sigyliph, then it takes superpower. If a bug comes out then it will be ganged up on and whipped out.