PokéBase - Pokémon Q&A
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Best answer

See this answer for a basic explanation.


Since it's a little vague (which I never noticed, seeing as I thought it made sense. Thanks for the feedback, Trach :P), I'll explain it in words.

Look at the article, there's a link (between the two questions, that is.):

"Damage is calculated when the attack occurs."

According to the code of a battle scene, every function for a move, not just damage, is calculated when the move is directly initiated.

In summary: Sketch will not copy a move until the ACTUAL ATTACK is used.

edited by

EDIT: I didn't realize the original article was going to make it seem so vague, and I personally apologize for that. I'll change this comment into the answer, to prevent future confuse.

Again, I apologize.