So here is one of the rare mega move sets.
Scizor-Mega @ Scizorite
EVs: 252 Atk / 20 Def / 236 SpD
- Bullet Punch
- Swords Dance
- X-Scissor/Bug Bite
- Roost/Night Slash
Ok, now lets talk about the strategy behind the set. Given it's defense stats, it should be able to take a hit while using Swords Dance. You can go for another (probably) if the opponent switches out. Now you can go for a Bullet Punch, which goes from a base power of 90 damage (x2.25 thank to stab and technician) to an incredible 180 damage, which means you can take out most of the team, if not all. If the opponent is slow, then maybe you can go for something like X-Scissor, Bug Bite or Night Slash. Bug Bite does 90 damage thanks to technician (opposed to an 80 damage X-Scissor, 120 with stab) and 135 damage with stab. Bug Bite also eats the opponent's berry, so it's a better choice than X-Scissor. Roost is there for some nice sustain, and Night Slash is for coverage (I like Roost better though).
I really hoped this helped! I put a lot of effort into this!