How did a Cacturne have spiky Shield?

Question

So, flashback time!
One day, I encountered a Cacturne (I don't remember if it was a trainer battle or not) and it had spiky shield. I was surprised because I knew that Spiky Shield was Chesnaught's signature move.
Is this a glitch, or is this just my memory failing me and remembering things that didn't really happen?

Answer 1

In ORAS, Cacturne was able to learn that move via level up at Level 32.
All of the Kalos starters sig moves(except Greninjas Mat Block) where made available to another Pokemon

Comments

Thanks!
Also, who gets mystical fire?

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Mismagius

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Oh, okay

Answer 2

The move might have been needle arm, which cacturne and cacnea get through level up. Furthermore, the chespin evolution line also have access to needle arm, which might be the cause of the confusion.

Comments

Thanks! But I checked the page and it says cacturne can learn spiky sheild