So I've been wondering what is the block data for preventing the message "It won't let its guard down!" from appearing. During gameplay, it will appear when a pokémon is too strong for you to catch, depending on the number of badges you have at the moment.
In my case, I was trying to find a way to legitemely shiny hunt a Regidrago/Regieleki without having to complete the entire game once again. So I just found that you can edit the block data 1B882B09 and set the field Badges to 255. This way, you can try to catch any pokémon you want without having to complete the game.
Also, for further notice, the location of the cave is:
Current map: 3245749397226141257
X coordinate: 1800.000000
Z coordinate: 0.000000
Y coordinate: 2526.000000
ZYX Scales: 1.000000
Rotation: 180.000000
Happy hunting! Cheers!