This tutorial will show to to activate PKHaX mode on PKHeX. This mode will allow you to give Pokemon illegal abilities, stats, and much more.
Please Note: "Project Pokémon does not support or condone cheating at the expense of others. While this community contains research, information, and utilities allowing people to create their own Pokémon, we do not agree with using them against players who are unaware that significantly hacked"
Please visit the following page for more information