What is "Wild Area News"?
In Gen 8, Promoted/Event Raids has been introduced as a way for players to try to encounter (and potentially catch) mons that were event exclusive, or have the stuff that are harder to find normally to have a more common encounter rate.
Examples of event exclusives:
Gigantamax Milcery, Gigantamax Hattrem Examples of 'them being harder to find normally"
Any of the featured Gigantamaxes (normally 5-10% rare den only, normally 5* only)
How does one update the "Wild Area News" in game?
Either grab a Mystery Gift in-game (Serial or Nintendo Network [internet gift])
or use the Mystery Gift -> Update Wild Area News option.
How are they stored in the save?
They are stored as 4 to 6 different blocks on the save.
PKHeX can dump them via the Block Data button.
The 4 blocks are KBonusRewards, KDaiEncount, KDropRewards and KNormalEncount.
kNormalEncountRigel1 was introduced for Isle of Armor, kNormalEncountRigel2 was introduced for Crown Tundra.
The files have been seen on the Event Gallery. How can users import them?
Download the .rar, extract the 4 to 6 files from inside the archive, and import the 4 to 6 files into the corresponding blocks.
There is a tutorial regarding blocks importing.
All 4 to 6 files must be imported from the same index to make the raids appear in-game.
What are Indexes?
Indexes are the way we implemented to differentiate the various changes to the Wild Area News files made by the server.
Indexes can be observed from the files.
So far, the first byte in the file denotes the index of the file, and whenever the server updates the Wild Area News,
and the server always increments the Index by one, even if the raids are the same.
While the index on the first byte is in Hexadecimal, we name the archive in Decimal.
(So 0x0E as 14, for example)
As an example, when a certain event is ongoing (A), and they interrupt (A) with a different event (B).
When (B) ends and they go back to (A), as opposed to using the original index (A) had, they (so far) +1 to (B).
At some times, there is no rhyme and reason to why the servers change indexes for the same event distribution.
Importing older Wild Area News without rigel1, into saves that are from 1.2.0 and above
As of v.1.2.0 of the game, they added a new file called normal_encount_rigel1,
which is used to activate wild area events in Isle of Armor.
For wild area events Index 24 and lesser, there is no need to import a file into kkNormalEncountRigel1. Importing older Wild Area News without rigel2, into saves that are from 1.3.0 and above
As of v.1.3.0 of the game, they added a new file called normal_encount_rigel2,
which is used to activate wild area events in Crown Tundra.
For wild area events Index 39 and lesser, there is no need to import a file into kkNormalEncountRigel2.
What does some of the details in the comments mean?
Least/most amount of event dens on reset - the amount of event dens on reset, with the reset either being forced by day change, or by clearing all the dens in a sub-region (Galar/IoA/CT) Chance of event from wishing piece - the chance of getting the event den by using a Wishing Piece. The Event VS ROM dens roll occurs before Purple light VS Red light roll. Checksum over Pokémon encounter data - This gives users a quick look over whether the encounter from the files are exactly the same. For example:
An additional point I'll like to bring up: the files are only checksum'd over Shield's Pokémon Encounter area, so that the checksum won't change simply because the index changes.