Do Flame body, Magma Armour, and/or Steam Engine stack?

Question

I have a Magcargo and Talonflame hatching eggs, and I feel like I may be wasting a party member.

Answer 1

No

From Pokémon Emerald onward, if a Pokémon with Flame Body is in the party (even if fainted), the number of cycles it takes for all Pokémon Eggs in the party to hatch are halved. This effect does not stack with itself, Magma Armor, or Steam Engine; however, it can be stacked with Hatching Power Pass Power, O-Power, or Roto Hatch.

Source

Comments

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*uses Magcargo to start IV breeding*