A wild Pokemon appeared that sparkled, but it was not Shiny?

Question

I was in the ruins area in White 2 and I saw a Sigilyph, the game said "a Sigilyph appeared?" and some sparkles came out. I don't think it was shiny. I tried to catch it, but I killed it.
What does this mean?

Comments

Thanks for editing it for me.

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Your welcome.

Answer 1

You have almost certainly encountered on of N's Pokemon.

Comments

you WHAT??? you KO'd N's Pokemon? I've only found ONE, and i made sure not to KO it. Rule of thumb with sparkly Pokemon: if it sparkles, it's rare! NEXT time, use an Ultra Ball to catch it, and a Low-Level Pokemon to weaken it.

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If you KO one of N's Pokemon, you can re-encounter them.