I don't really have any better general teambuilding advice, but one thing that makes the first fight a lot easier is if you can destroy Ribombee before it sets up Sticky Web. That's probably the biggest priority in that fight. In my case, I couldn't win without setting my Mamoswine and Greninja in my first two slots and targeting it with priority moves on the first turn. And even then I think Water Shuriken had to hit 3 times.