is there a way to gen future generation mons into older games?

[MettyPoppins]

Hi. new user here, long time lurker. i made my account in hopes of getting some assistance with a newbie question. i was using PKhex and wondering if there was a way to add future generation mons, at least to the player party. that’s probably a really easy answer for most, but i’m technologically illiterate, so i’d appreciate any patience given . if this post in any way isn’t within any rules i’m unaware of, or isn’t appropriate for this specific topic, i do genuinely apologize and will delete immediately (as far as i can tell, this is the most appropriate) thanks in advance! 

[BlackShark]

This can only be done by modifying the ROM.