Me First can be replaced with Ice Beam or Lunge.
Ribombee would just slow your grind down, if anything. :P
I don't suggest using Glass cannons like Pherimosa or Salazzle in the Battle Tree, even with screen support. You'll get sweeped every time they lead with Blaziken or maybe Sharpedo. I suggest using a D-Dance user like Mega Gyrados or Mega Salemence, A good Z-Nuke like Tapu Koko or Nasty Plot Naganadel, and a Scarf Sweeper like Blacephalon, Kartana, Heatran, or Tapu Lele if you want to sweep quickly and make it past 50 wins. :P