Hello there,
I’d like to teach Taunt to my Mew. Can anyone hack Taunt into my game, or just teach Taunt to my Mew after trade and return it to me? Please 
Regarding the first option, read this. If you want somebody else to give it taunt, ask in #online:trading.
Technically it would not be hacking, since I should have the TM, but it isn’t available due to developing errors. Understood however. Thanks.