Why did one of my bred Torchic get Low Kick instead of Peck?

Question

i have a male blaziken I chose as my starter in omega ruby, then transferred from it to various later games (i forget which of y and moon, definitely in ultra moon) then to sword. I bred it with a ditto caught from sword, with 32 offspring. 31 of them have scratch, growl and peck as moves. 1 has scratch, growl and low kick. is this normal?

Comments

upon transfer to swsh, the blaziken had the same moveset, but it had sky uppercut. since it was discontinued in gen 8, i used the superpower tr.
thank you all for helping

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Did the Blaziken level up and learn a move while it was breeding?

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Does this count as not answering a clarifying question?

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This user has not been active since 2020

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It is reasonable to write an answer that addresses both scenarios without knowing which one applies to the problem, so no, this does not break rule 1.4.
Though, I don't see why that information would help answer this question. I think OP is mistaken in some way because the scenario as they describe it is impossible.