My advise for making a team would be a team where you can switch as cleanly as possible. An example is Hydregion and Aegislash, or Rotom W and Scizor, each covering each others weaknesses. You can switch but the AI can't so you want to use that to your advantage. My favorite thing to do is find a MegaEvolution you really like and try to build a team around that. I think each Mega can take down the tower with the correct team to shore up its weakness.