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With the excellent additions to the battle system made by @kerizane late last year, I think we are most of the way to having the battle system fully implemented.
As far as I can tell, the main outstanding part is implementing conditions. Conditions are positive or negative effects (buffs or debuffs); a monster can have one at a time, and some conditions clear existing conditions while others do not.
Full details here: https://forum.tuxemon.org/thread.php?id=255