Gym Tips

Know which pokémon are better at attacking: Remember that type trumps CP, but, in general, use pokémon like:
  • Snorlax
  • Dragonite
  • Lapras
  • Vaporeon (even after the patch)
  • Arcanine
  • Exeggutor
Leave your best defender behind: The best defenders to place in an empty gym usually have the most health, so they can last longer against attackers. The best defenders, in that order, are:
  • Lapras
  • Poliwrath
  • Dragonite
  • Snorlax
  • Exeggutor
  • Slowbro
Taken from: http://lifehacker.com/six-tips-for-controlling-all-the-pokemon-go-gyms-in-you-1785369171