Hey,
i tried to teach my Crobat (lvl 90) Cross poison, i choose the attack, it takes 2k and thats it, nothing else happens.
tried to relogg but nothing, 6k gone rip
€dit: my friend tried it and it worked, the only different was, i tried with holding leftover and my friend without any item on it, maybe this is the bug and is replicateable/fixable.