Celebi can't learn nasty plot?

[0BLIVION]

i read every time in every wiki and smogon, and i see celebi can learn nasty plot with the TR, why pkhex mark it and invalid move?
Im wrong?

Edited July 24, 2020 by 0BLIVION

[ICanSnake]

You know it's a TR so you got it half right, your next step is to fill out the TR section. You currently have it as if Celebi learns Nasty Plot through level up or TM, which is only an event exclusive move. Remember TMs are different than TRs, so they have different properties. I'm sure you saw the Technical Records button below the egg moves, right?

[theSLAYER]

Check mark it in form that the Technical Record button (covered by your legality analysis) opens.

When mons learn TR moves from TRs, the game has the TR being able to be infinitely relearned (so you could forget it and relearn it, without using another TR, later).
You didn't have that Technical Record checkmarked, thus illegal.