Wonder Trade evolution learnset glitch

Miscellaneous glitches in Pokemon X and Y and Pokémon Omega Ruby and Alpha Sapphire

3D effect glitch | Backward sign reading glitch | Drasna Aura Sphere glitch | GTS filter glitch | Imported Eevee glitch | Mystery Egg glitch | Lumiose City save glitch | Poké Mart marquee glitch (Omega Ruby and Alpha Sapphire) | Pokémon Day Care sign glitch | PSS save glitch | Sky Trainer glitch | Stereo sound glitch | Stolen Poké Ball glitch | Wonder Trade move glitch

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This glitch occurs in Pokémon X and Y.

Method

When a Pokémon evolves through Wonder Trade and gains a new move from it, both the new move and the old one will disappear.

Cause

As of now, seeing as no ROM data is available for the game, it is thought that a coding error causes the new move to be marked as invalid. This, paired with the old move being marked as invalid from being overwritten, causes both to disappear.