Ash, just because you're newer to ASB than I am, don't expect me to go easy on you. I'm a seasoned vet, and even if you win this one, don't expect to win it without getting a huge fight from Sabre. He's one of the Pokemon I started with back in 2005 (that's almost 10 years ago!).
Okay Sabre, I had a hunch we would have a type disadvantage, but let's make the best of it.
I want you to start with a Mega Evolve and Detect combo so that we can avoid both the Force Palm and the Toxic, then, I want you to use Me First on that Aura Sphere to leave your opponent hurting right off the bat!