Fighting Spam= happy FletchFletchinder is really a very usable Pokemon in this metagame, especially against the more offensive teams in this metagame. A lot of people use Mega Gallade, Mega Lopunny and Mega Sceptile, and Fletchinder does a great Job at revenge killing them. But it's really good outside of beating the new megas, simply by burning relevant Pokemon, like Empoleon and other things, and making them easier to wear down. It indeed needs some support, but I found it very very effective, often sweeping teams at +2 and more often getting important revenge kills, when the opponent cannot allow you to get to +2.
The meta is so HO atm that having that priority Acrobatics is a huge boon. Unfortunately, some of the biggest issues for Fletch are the other S ranked mons Zygarde and Suicune. They dont care too much for weak acrobatics or even WoW thanks to Sub, Lum Berry, RestTalk.