yea I don't have two 3DS's to test it out but we have always been able to trade and battle within the same generation. The only thing is that we can't trade or battle with anything that didn't exist in Sun and Moon.
btw I don't know if it's been said here (or if I even said it, I haven't got much sleep so my memory is terrible) but
btw I don't know if it's been said here (or if I even said it, I haven't got much sleep so my memory is terrible) but
you're gifted Poipole immediately after you defeat Ultra Necrozma. if you want to soft-reset for a specific nature, IVs, or shininess make sure to *decline* the offer. They'll still hold on to it for you. If you immediately accept it and want to reset for any reason, you're gonna have to re-battle Necrozma all over again which might get tedious considering it gets a +2 omni-boost aura