Question Event Raids in Pokemon Scarlet & Violet in PKHex.

[Legarad]

To return a game to normal in other words, for example, remove the Charizard event, did I have to first backup the corresponding blocks before importing the event raids? 

[Atrius97]

No. You can either connect online ingame and have them automatically update to the latest Poke Portal News, or you can import the blocks from a different Poke Portal News event. 
Here are the blocks for "no event"

[Legarad]

10 hours ago, Atrius97 said:

No. You can either connect online ingame and have them automatically update to the latest Poke Portal News, or you can import the blocks from a different Poke Portal News event. 
Here are the blocks for "no event"

Thanks for uploading it, which means I did it correctly on my own. Start a new game until I could save, extract the corresponding empty blocks from the new save file and import it into the old save file