Events live in the us.timinc.mc.cobblemon.counter.event package, and can be accessed via CounterMod.Events.
RECORD_PREFired early on when considering recording a stat update. This event can be cancelled. Doing so will result in the stat record not going through.
managerThe manager to which this record will be attributed.
counterTypeThe counterType (aka the stat type) that is being recorded.
speciesIdThe finalized ID of the species that is being recorded.
formNameThe finalized name of the form that is being recorded.
pokemonThe Pokémon that triggered the record.
RECORD_POSTFired after an stat update has been recorded.
managerThe manager to which this record will be attributed.