GO Battle League Known Issues
Issue description: Sometimes Fast Attacks take longer than expected to land. This is more noticeable in quicker Fast Attacks.
Issue status: A potential resolution will be included in an upcoming release. We are testing this resolution to verify its intended effect.
Sometimes opponent avatars or Pokémon from previous battles appear in the current battle.
Issue description: Avatars or Pokémon from previous battles sometimes do not clear when starting the next battle, leading to them staying on screen.
Issue status: Mitigated in upcoming release
Issue description: When first starting a battle, Trainers may be able to see the user interface at the top of the screen that notes the opponent’s Pokémon before the starting countdown finishes.
Issue status: Resolved in release (0.227)
Issue description: In some cases, after executing a Charged Move, Trainers may not be able to damage their opponent for a short period of time.
Issue status: Investigating
Issue description: Trainers can see a delay from when they finish their Charged Move minigame to when the Charged move lands. Their opponent may in some cases experience instability as well.
Issue status: Mitigated in release, and continuing to investigate for a long-term solution
Issue description: Fast Attacks sometimes inconsistently land on your opponent’s Pokémon just as your opponent uses a Charged Attack.
Issue status: A potential resolution has been found. We are testing its interactions with other fixes.
Source: Official Pokémon GO support page