Finding Event Flags and Event Constants

I'm not used to PKHeX so I'm likely doing something wrong or misunderstanding how the Event Flag Research works, but: in Crystal, I saved just before and after talking to Carrie, the Mystery Gift girl in green on floor 5 of the Goldenrod Dept Store. Talking to her is what unlocks the Mystery Gift option in the main menu. Placing the pre-Carrie and post-Carrie saves into the Researcher brings up nothing. Just the Alert "No Event Constant diff found."

Am I using the Researcher wrong? It's not like I understand what the flags or constants mean. It's also possible that the Mystery Gift unlock isn't a flag, but I don't understand how that could be the case.

On 5/12/2023 at 10:35 PM, SupremeThunderDragon said:

I'm not used to PKHeX so I'm likely doing something wrong or misunderstanding how the Event Flag Research works, but: in Crystal, I saved just before and after talking to Carrie, the Mystery Gift girl in green on floor 5 of the Goldenrod Dept Store. Talking to her is what unlocks the Mystery Gift option in the main menu. Placing the pre-Carrie and post-Carrie saves into the Researcher brings up nothing. Just the Alert "No Event Constant diff found."

Am I using the Researcher wrong? It's not like I understand what the flags or constants mean. It's also possible that the Mystery Gift unlock isn't a flag, but I don't understand how that could be the case.

Event Flag Research only searches in a small subset of the savefile where most events are stored. The flag used to determine whether you unlocked Mystery Gift is not located in that subset. In US savefiles, it is located at address 0x0BE3 (value is 0x00 if unlocked). Event flags tracked by the Researcher start at address 0x29F3.