提案/Suggestion
The Monster Guide unlocks an entry for a monster the first time you defeat it. But due to monsters being partially reset each season an icon should be present showing if you can find them or not on their menu next to weaknesses and habitats they are in. In addition a good idea could be to add icons for low spawn rates (subspecies, certain monsters) and high spawn rates (events)
現状/Current Status
No such indicators, the only way to know is to remember