A simple method of evasion and attack will help you cope with the enemy any level. It is enough to follow the yellow “flash” your opponent and immediately dodge the impending attack.
At the beginning of each battle your enemy will immediately attack 2 times. Now you know you need to dodge quickly! After dodging (holding your finger across the screen from left to right), quickly hit your opponent, pressing on your Pokémon (not on an enemy Pokémon!).
Note: The flash → evasion → attack! → repeat.