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PKHeX is open source, and is split up into separate projects to produce .dll files with non-visual logic residing in PKHeX.Core https://github.com/kwsch/PKHeX PKHeX.Core is available on NuGet. https://www.nuget.org/packages/PKHeX.Core/ You can reference the dll/nuget in whatever script, and call whatever functions you want. LINQPad is pretty useful for this, if the scripts are small in scope. PKHeX also supports custom plugins, so you can write your own code to be triggered via the main GUI, which is easier if you want to share your custom scripts with less capable users.

Geez why don't you check the notes on the download page? and why can't you figure it out that 'error' = 'save wrong' or 'unsupported'? Even if you weren't trying to cheese the system, if you couldn't figure out that PLA wasn't supported yet, the next 'natural' question when someone tells you it ain't supported, would be 'when'. And the answer to that is don't ask. It's out when it is out. Until then, enjoy playing the game.

Just have to be patient with great creator

Oh boy, it's that time of year! Taken from our Discord: Basically don't ask. It'll be out when it is out.