Hey,
The title probably didn't explain much, but I can't find a clear answer anywhere, so here is my question.
Can you use a TM, such as Power-Up Punch, that isn't in the latest game, on a Pokemon in a gen 6 game (or transferred down from a gen 7 game) then PokeBank it up? So you could have, in the latest gen, for example, a Kangaskhan which knows Power Up Punch.
Thanks