...How about releasing just a set of basic skins (e.g. SkinA.png, SkinB.png,SkinC.png etc.). People could just call the custom skin they want one of those names and then put it in the mod file. That would work well because it would work in Single Player/Individually but it would also work for Resource Packs, as the RP could include a 'Steve Trainer Skins' folder with the skins that RP needs, meaning they would appear instead of the skins in the mod file because of the same basic names being used. This already works with the few skins in the mod (see Challenge Accepted's RP for their 'Pokémon: Iron & Coal' Server). [P.S. That last bit wasn't advertising the server, it's just a great example of what I mean]. Please consider this as it would help SOOOOO many people! XD
...How about releasing just a set of basic skins (e.g. SkinA.png, SkinB.png,SkinC.png etc.). People could just call the custom skin they want one of those names and then put it in the mod file. That would work well because it would work in Single Player/Individually but it would also work for Resource Packs, as the RP could include a 'Steve Trainer Skins' folder with the skins that RP needs, meaning they would appear instead of the skins in the mod file because of the same basic names being used. This already works with the few skins in the mod (see Challenge Accepted's RP for their 'Pokémon: Iron & Coal' Server). [P.S. That last bit wasn't advertising the server, it's just a great example of what I mean]. Please consider this as it would help SOOOOO many people! XD