Update 2024/09/18:

The DLC Cat situation for 4G is a bit complex. (I still have no idea about 4U)

After a bit of research, here's what I've found:

Here is a page that lists every DLC Cat distributed for MH4 & 4G.

Assuming that the atwiki page is complete, there are 2 things relevant for archival:

1. The DLC cats distributed for MH4 (the base game, not 4G) were never released for 4G, so no legitimate 4G extdata will have them.

However, at least some (maybe all) of them are included within the Goshawk server archive, so someone could theoretically decrypt them and hex edit them into a 4G save.

The decryption keys should be within Goshawk, but here's a more useable link.

2. For 4G (and maybe even base 4), there were some DLC cats distributed at limited times and limited events (like USJ). The files for these cats aren't in Goshawk, so they seem to be lost to time and recreating these cats exactly probably won't be possible.

The atwiki link above does list the unique skills that these cats would've had, so it should be possible to modify existing cats to use them using a hex editor (or a save editor).

The 4G extdata I've included in the OP has all the 4G DLC cats that were distributed regularly, and the files for those cats are within Goshawk.

The extdata also has some limited release cats like Nanako G, so it's actually slightly more complete than Goshawk.

I have no idea if the stats & skills for these cats are legitimate (cheating was quite rampant in 4G), but at least for the cats that are in Goshawk, it should be possible to confirm.
For the other cats, I could compare with the skills listed on the wiki, but the stats might still be illegitimate.

I have managed to decrypt the 4G cat files, but I'm not in the mood to export cats and and diff them atm, so that'll have to wait for a future update.

Happy nyanting :P

Update 2024/07/16:

I have checked every event quest against Ping's Dex and can confirm that these saves include all of them!

However, many DLC cats for MH4G (possibly even MH4U) are missing. Nothing can be done about this until goshawk (unless someone has a source).

rouxfmc:

z2 y' // inspection (32 STM)
M F2 R' F D' F2 // (Blue-White) FB (6)
r U' R2 U2 r2' U' r U' r' U2 r // (R2) nmSB (11)
U2 R' U r U2 r' // 1CLL (6)
M U' M' U' M2 U2 M U' R2 // LSE (9)

view @ alpha.twizzle.net

Monthly 3x3 Scramble:

F' U2 L2 F D2 L2 F2 L2 R2 D2 L' U2 R' D' F' D B' D U' R'

view @ alpha.twizzle.net

Update v1f (final):

• I forgot to include the text for the original post on reddit. It contains a lot more info and is more explicit about the sources. The file is included as "mh dlc compilation.md".
• The DLC cats "ぽかぽか" & "ミケゴールド" in the MHXX save had their info translated into English. The complete save now has the original text.

As long as I'm not forgetting any event quests, all the saves should be 100% complete.

Notes:

• The MHXX save doesn't have the USJ Real item pack, and not all DLC cats are available for hire. Nothing can be done about the former (afaik), and you can import DLC cats using a save editor with the included files.
• In MH4G/MH4U, some pieces of gear require "Elder Bfly Beetles", which can only be obtained through "Hunters for Hire". Use a save editor to hack them in.

Happy Hunting :)

Thanks for all the hard work o7

Oh, the mod list does show your name on .world, but it's empty on my home instance.

Good luck modding~

Thank ye kindly. Are you a mod here? (The mods section is blank for me)

I'm just sad that the people that helped me complete this won't get to see it :(

ranting about reddit:

Something similar has happened to me before, when I posted innocuous .ru and appspot (dunno what the wider website is) links.
Not only were my comments locked at 1 upvote, any comment I upvoted was too. I felt quite shitty not being able to upvote anything.
Still, why would they filter out archive org links? I'm sure I've seen others post them before...

Good purchases imo. The WRM 21 is my main!

They're also both very different cubes: The WRM is fairly flexible and the Super RS3M (v1) is quite blocky (It also has weak magnets). Dunno about the other Super RS3Ms (v2, v5).

Note that the Super v1 is very different from the RS3M 2020. I've never tried one, but from what I've heard the 2020 should be somewhere in between the 2.

The WRM 2021, WRM Maglev or Tornado v3 are great because you can adjust the strength of their magnets.
Any other WR M and most other cubes have really strong magnets and don't have adjustment features at all.
You wouldn't wanna be stuck with a cube that's hard to turn.

Adjustable magnets can have an annoying clicking sound though.

I've heard the RS3M 2020 (that zarxrax recommended) has weak magnets, which is great. They won't click and annoy you and if you wanna try out stronger magnets, you can buy additional magnets and add them in (very easy).

Again, I might be wrong, but:

Full PLL is 1 look PLL. Using 1 algorithm to solve PLL.
Full OLL is also 1 look and uses only 1 alg.

Are you sure you meant 4 look PLL and not 4 look LL (Last Layer)? That would use 2 look PLL and 2 look OLL.

Speedsolving Wiki has good info on terminology.

CFOP is a method (more optimized version of LBL(Layer by Layer))

PLL is an algorithm set used to Permute the Last Layer (which can be split into 2 steps or looks). I'm not familiar with CFOP so I don't know if 4 look PLL is a thing.

I use the Roux method and I highly recommend trying out other methods! It's harder to learn them once you're set in your ways :P

Roux, using CMLL (some CMLL2 and CMLLEO)
What about yourself?

This is subpar but I felt obligated to post something :P

rouxfmc: Green-White FB (35 STM)

y x' // inspection
D r U' R2' F U' R U' M' B' // FB (10)
M2 U2 R U' r2' U2 M U // SB (8)
y' z'
f2 R' F' r U R U' r' // 0CLL (8)
S U' S' U2 S' U' S U2 S // LSE (9)

view @ alpha.twizzle.net

Vive la Rouxvolution!

Monthly 3x3 Scramble:

D2 B2 U' B2 D R2 B2 F2 D2 U L U' L2 R B2 F D F2 R D

view @ alpha.twizzle.net