So, I was shiny hunting Reshiram for a while, and then I thought that I didn't had a good False Swiper. Gallade and Absol can both learn Thunder Wave, False Swipe, and Swords Dance. I can get Mega Gallade, and I can try getting a Hidden Ability Absol if that's needed.
Note that I ain't gotta use these Pokémon only on Reshiram.
100 % Mega gallade. Absol always gets easily taken out, while mega gallde with massive defenses and atk, is bascically a powerful attack.
Try using this moveset too:
252 atk 252 speed, 4 def.
-IDK WHATEVER YOU WANT