• Rework gym API to be synchronous
• Add misc effects
• Fix misc bugs
• Update data
• Drop python 3.6 support and add python 3.10
• Revamp inits

Thanks to @MatteoH2O1999 and @akashsara for your amazing work :)

• Add replay saving feature to Player objects - use Player(..., save_replays=True) to try it out!
• Unify ability representation
• Better handling of hiddenpower, especially in gens < 8
• Add missing AbstractBattle abstract_property values
• Add Battle.opponent_can_mega_evolve / Battle.opponent_can_z_move properties

• Update data files
• Improve move message parsing
• Better capping of number of moves (to 4)
• Clarify Battle.weather typing

Minor:

• calling EnvPlayer.step when reset wasn't called raises an Exception, as per some open ai gym implementations

This release adds:

• handling of -swapsideconditions messages
• log.info /log pm messages instead of log.warning them
• Fix hidden power Moves initialization - their type is now correctly inferred
• Fix hanging env_player.reset when called before the current battle is finished
• env_player.complete_current_battle now forfeits instead of performing random moves until the battle finishes
• env_player.step(-1) forfeits the battle

• Coroutines are no longer stored in PlayerNetworkInterface - this should eliminate a bug where keeping Player objects around for a great number of battles lead to a monotonic increase in RAM usage
• Set Pokemon object ability property when there's only one possibility
• Better ability parsing
• Better items parsing

• Better item and ability parsing
• Create ForfeitBattleObject
• Misc bug fixes
• Gen 1/2/3 data storage
• Update data

This release lets users set gen 1, 2 and 3 formats. poke-env will fallback to gen 4 objects and log a warning, as opposed to raising an obscure exception, as in previous versions.

Misc: removed ailogger dependency

This release makes poke-env compatible with the new pm-based pokemon-showdown challenge system.

• Fix a bug causing toxic counter to increment incorrectly when a Pokemon was switched out
• Fix a bug causing multiple terrains to be present in Battle.fields simultaneously