Is there a way to hack the data of a legitimate/in-game Pokemon?

I’m curious. I know someone who has hacked their ingame Pokemon to be shiny once, and I wonder if it’s possible to do the same but give ingame Pokemon its hidden ability or egg moves it didn’t have before, or change its nature. It’s been making me curious.

Pleaselog inorregisterto add a comment.

I have Action Replay 3ds and I know (at least) in X/Y and OR/AS you can put a Pokemon in the first slot of the first box and turn them shiny. You can change their nature, moves, and ability too. you would have to give yourself 999 in the first 8 items though. You need to drop a certain amount of items with the moves you need;http://bulbapedia.bulbagarden.net/wiki/List_of_movesI haven’t done it in such a long time, but if you want me to figure it out again I can figure it out.Edit: The codes for SuMo is in folders named stuff like “Poplio Folder” and “Pikachu folder”. They probably have the same things though.

Yes. there is this thing called PokeGen, it still exists. I prefer not hacking though, because if you take hacked Pokemon online, nintendo catches you, and BANNED from all online stuff. it happened to me, and I had to erase everything.