How is the game checking if previously caught Charzard?

[Evo]

Hi does anyone have any ideas what block is being used to state the event Charizard has already been caught? I made a save once updated before I captured and I'm comparing the blocks to a save after I cought it and I've replaced a fair few values tring to find it via trial and error but haven't had any luck.

As the event raids have a very strict legal check I just wanted to catch a few, any tips would be super appreciated!

Edited December 2, 2022 by Evo