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Probably handwritten into a blockquote Basically, there's a correlation. Each wild encounter has a 32bit seed, which generates the EC, PID, IVs, Height & Weight. We can easily derive the EC by reversing the algorithm to get the seed, then we can run it forwards to make sure the seed yields all the resulting features. If it doesn't match, you get the error message. If you're curious how the logic is translated in PKHeX's code: https://github.com/kwsch/PKHeX/blob/223b56d779c11019482f8b97cfcf62312342b867/PKHeX.Core/Legality/RNG/Overworld8RNG.cs It's similar to Gen3/4's PIDIV restrictions, hence the same error message.

Just wait until tomorrow, or maybe in a few hours. Updated!

The plugin needs to be compiled from source for now, I'll publish a new release tomorrow (Mirage Island and WC3 Plugin will be updated tomorrow as well).