Can someone help me run stat calculations on these 3 scenarios?

Question

So, my club is having a mono type tourney.
It's a different type of tourney. We need ALL moves to be the same type as the Pokemon. So all my moves have to be Normal. (Except for dual types, that is). AND I GOT PAIRED WITH STEEL.
Porygon-Z has a strong Normal type move, Hyper Beam, in it's arsenal. So I need 3 stat calcs.

Italicized: Scenario 1 Bold: Scenario 2 Regular text: Scenario 3

Porygon-Z @ Normal Gem
Trait: Adaptability
EVs: 252 SAtk
IV: 31 SAtk
Modest Nature (+SAtk, -Atk)
- Hyper Beam
VS

Steelix
EVs: 252 HP / 252 SDef
IVs: 31 SDef
Careful Nature (+SDef, -SAtk)

Porygon-Z @ Normal Gem
Trait: Adaptability
EVs: 252 SAtk
IV: 31 SAtk
Modest Nature (+SAtk, -Atk)
- Hyper Beam
VS

Registeel
EVs: 252 HP /184 SDef
IVs: 31 HP / 31 SDef
Careful Nature (+SDef, -SAtk)

Porygon-Z @ Normal Gem
Trait: Adaptability
EVs: 252 SAtk
IV: 31 SAtk
Modest Nature (+SAtk, -Atk)
- Hyper Beam
VS

Ferrothorn
EVs: 252 HP / 184 SDef
IVs: 31 HP / 31 SDef

Answer 1

Steelix

252 SpAtk Modest Normal Gem Adaptability Porygon-Z VS 252 HP / 252 SpDef Careful Steelix: 73, 45 - 86,44 %

Registeel

252 SpAtk Modest Normal Gem Adaptability Porygon-Z VS 252 HP / 184 SpDef Careful Registeel: 42,86 - 50,55 %

Ferrothorn

252 SpAtk Modest Normal Gem Adaptability Porygon-Z VS 252 HP / 184 SpDef Careful Ferrothorn: 53,69% - 63,35%

Comments

That much to a REGISTEEL!? O_o From the looks of it, Mew, you're toast.

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The damage isn't as high without the Gem, so the second hit will be weaker.

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Then he should run Choice-specs. That way he can hit for the same damage each time.