Now 100% more demonic
The problem is that Gengar and Bisharp are unviable in Ubers. The only really relevant Poison type (that runs Poison moves) is Eternatus, which is usually forced into specially defensive spreads for Kyogre. There are Steel-types, but with the right prediction every single one is at worst 2HKOed by the correct coverage move from Choice Band sets, even full physically defensive Necrozma-DM.Beating Zacian-Hero is possible.
All you need are
1.toxic spikes or toxic itself
2. choice specs gengar or other specially offensive poison type.
3. steel types like bisharp.