So I made a fast graph just for presenting this idea. Visually showing raw strengths of moves on various sets could be useful for newcomers to understand how some moves stack up against others. The data was taken from the damage calculator from various Kyurem-B vs a 1 Base HP, 1 Base Def, and 1 Base SpDef test mon with no EVs or IVs (1 HP and 7 def and spdef points). The vertical column is how much HP a Pokemon with the lowest bulk would lose from these neutral hits - keep in mind blissey only has 714 HP with maximum investment. I choose this way of presenting the hits because if I were to make charts for more viable 1v1 mons you could numerically compare what moves are the strongest in 1v1 and know what you'll be surviving from investing to live through a more powerful move. For example, if you take all of these moves neutrally like you were a ghost type with godlike bulk, then knowing if you can tank a +252 Atk Subzero Slammer from the Icium set and you can tank a +252 SpA Devastating Drake from the special Z-Draco meteor set, then you can tank all of Kyurem's moves shown here. I need criticism and ideas on how to make it better and maybe we'll see what happens next with these.
And just so this isn't a one-liner...
Yeah yeah, I get it, Adaptability Hyper Beam, blah, blah, blah. But try to answer this: What does Porygon-Z have going for it besides one extremely powerful nuke attack? It has average/mediocre stats aside from Special Attack, a bland typing, and while it's movepool is nice, there are a lot of things that slip by it, due to those coverage options falling short of KOes. Hyper Beam is still awesome, and it can be deadly with a Choice Scarf, but I don't think it's on the same level as Tapu Koko and Lele. While those Pokemon have tons of sets that can perform many functions, Porygon is kind of a one-trick pony. Again, not bad at all, but extremely predictable; too predictable to be ranked just shy of giants like Kyurem-Black.