I don't know if it will be possible for those two to have that ability as it needs a custom routine to have an ability like that in the 3rd gen game.
The game has 25% chance of having it. :3
Also I'm announcing that I will re-do everything in the hack from the story to tiles and some sprites. So I would really love to have some suggestions for the hack.
Also if you want to be a trainer in the hack you can post here and post a format like this.
I'm really sorry if you can't pick your pokemon as I'll be picking them. :3