I'm not sure if this kind of question is meant to be here, nor do I know if it has been answered. However, I've been wondering about it for a while, so I'm just going to ask it.
I've been confused as to the exact definition of "hacked" Pokemon. I can easily determine the basic meaning, but I've read some stuff that has confused me. Now, I have used an Action Replay code to obtain certain Pokemon early, such as Tauros or Arcanine. I just put in their Dex number, the level I wanted, the nature I wanted, and walked in grass to get them. I didn't modify them in any way. So would those Pokemon be classified as "hacked"? I only wonder because they are otherwise normal. If they are, indeed, not allowed in competitive play, then I will follow those rules in the future.