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I just checked one of my rock head breedjects and it evolved into cursed body. Thank you for informing me about this. I will remove the cubone from my thread.
It turns out rock head is one of cubone's basic abilities and battle armor is its hidden ability. So a battle armor cubone will evolve into a rock head marrowak but a rock head cubone will turn into either lighting rod or cursed body. I'm sorry for the confusion, I was also confused. The offer for two more pokemon is still on the table considering this was a misunderstanding on both of our parts.
What you said is right! It needed to have Battle Armor to turn into rock head on alpha Marowak! :) I will just take another mon if that is ok with you, 2 mons are too much I guess, let me check your thread ~