Pixelmon Mod

A way to link moveskills to specific moves within the moves json files
it would allow people to customize which moves get what movekills and would allow people to disable specific moveskills if they wanted to using a datapack

I'd rather approach it from the other direction:
Have dedicated Move Skill data files where the different conditions to unlock them can be defined.

That way you can set various conditions - like for Ore Sense, which can be used with either the moves Magnet Rise or Metal Sound, or via the ability Magnet Pull:

Or ones like Wormhole, which are available for specific Pokémon:


Those data files would also allow for detailed customization.

For example, the following attribute would make it so any Move Skills with grief potential are only avaiblable in singleplayer by default:
Servers then have the abilitiy to override them to false individually, if they do want them to be available.

Same for variants of the same Move Skill that have different requirements to unlock certain effects, like the different patterns for Ignite:

Other aspects that would be possible to set that way include cooldowns (fixed; linear relative to base/current min/max stats; addition of multiple values; etc.), usable/affected blocks (think Cut, Dig, Ore Sense, etc.), associated loot tables and/or spawns (Forage, Headbutt, Rock Smash) and many more.

Hey there! So, about linking moveskills to any move, I think it’s kinda tricky. I mean, not every move can just get skills slapped on, right? But maybe if we mess around with the coding, we could find a way. Anyone else tried this? Let’s brainstorm together! Would be awesome to see what we can come up with

You're free to write or commission a sidemod for that if you want (links to our sidmodding API can be found on https://reforged.gg/).
To me this feels like a feature that should be part of the main mod though.