Pokemon Go : Gym Battles

Use Below type of Pokemons while fighting a Gym Battle:

Here's a quick list of each element type, and what opposing types of Pokémon are best-suited to take them down:
Normal: Fighting
Fire: Water, Ground, Rock
Water: Electric, Grass
Electric: Ground
Grass: Fire, Ice, Poison, Flying, Bug
Ice: Fire, Fighting, Rock, Steel
Fighting: Flying, Psychic, Fairy
Poison: Ground, Psychic
Ground: Water, Grass, Ice
Flying: Electric, Ice, Rock
Psychic: Bug, Ghost
Bug: Fire, Flying, Rock
Rock: Water, Grass, Fighting, Ground, Steel
Ghost: Ghost
Dragon: Ice, Dragon, Fairy
Steel: Fire, Fighting, Ground
Fairy: Poison, Stee