Fast Attacks are the moves used when a Trainer taps on their Pokémon in a Gym. Repeated Fast Attacks recharges the Charged Attack meter.
Charged Attacks must be charged, which can be done by using Fast Attacks. The charged attack meter can be found under the Pokémon's HP bar in the upper left hand corner. Each segment of the bar represents a use of the Charged Attack. Once a segment of the meter has been filled, the Trainer can use the attack by holding down on the screen.
In addition to attacking, Pokémon can use Dodging by swiping either left or right on the screen. A Pokémon is preparing to attack when the edges of the screen flash yellow. A message stating "Dodged!" will appear if the dodge is a success.