This script does nothing unless a model refers to it. See an example: Umamusume Venus Park (With Expression).

Here is usage for modders:

How to use
Create a new txt file under MonsterHunterRise\framework\data\MeshGroupManager, put a pair of curly braces and save:

Rename the txt file to Armor ID.json, such as f_helm279.json:

Now the script is starting to controll female Guild Cross Circlet.
Some Armors using pfb may change the name in game, you can check the name in EMV-Engine, or change the name in pfb:


Basic feature
Now model's Group Index is synchronizing with palico's FaceType.
Group Index is a batch of numbers in mesh name, the second column:

Group is called "Part" in Capcom's code, and There is "FaceType" on Navirou(ota232), the index numbers are the same, Group0 = Part0 = FaceType 0. Only Navirou has FaceType, or Umamusume Matikanetannhauser (hunter and cat) made by chen2239389326, the index number is from 0 to 18.
To synchronize with FaceType means the showing group is the same with the showing FaceType.
And there are two rules need to know:

• If you don't hunt with a palico has FaceType, the armor shows Group0 and Group1.
• If palico is showing FaceType18, but the armor only has Group12, then the armor shows Group0 and Group1.
  

Make sure the Group Index is continuous increasing. For example, you can't skip 4 between 3 and 5.

Configuration
You can write some optional configurations in json file. Now there are only configurations about voice event. To enable configurations, write like this:
"VoiceEvent": {
}


The detail configurations is based on https://docs.google.com/spreadsheets/d/1r2K97igdGBfjWyFoHlzHB75ECZ6SqfS209V8WWGxy18/edit#gid=514645878, but there is a little different from it. You can check and copy configurations from  MonsterHunterRise\reframework\autorun\MeshGroupManager\MeshGroupTableList.lua

For example, i'd like to show Group 7 while cooking meat starting, write like this:
"VoiceEvent": {
"ItemsCookingMeatStarting": 7
}
Another example, i'd like to show Group 21 while disarming a Trap, add a comma and write like this:
"VoiceEvent": {
"ItemsCookingMeatStarting": 7,
"ItemsTrapDisarming": 21
}
Finally, the json file looks like this:

I'd like to use Visual Studio Code to edit json file, because it can highlight errors like:
Repetition:

Extra comma:

If you don't want to write configurations by yourself, you can just copy a json file you like, remember to adjust your model.

Credits
chen2239389326, Narathin, NSA Cloud, alphaZomega, ItsBurpee