Check out the section of the rules under "On Cloning, Hacking, and Glitches", it covers cases such as this.Let's say I used PKHeX to fill the Pokedex. I then go and talk to the NPC that gives the shiny charm to obtain it instead of hacking it in directly. Am I allowed to trade shinies I've caught on the save I've altered? I only did this because 1. I'm impatient and 2. These are older games.