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The latest commits on GitHub have already fixed the issue you're describing. That's why the development build properly flags it.

Using existing online structures is different from using local connection structures.

As a sidenote, this line on Bulbapedia makes me believe that even more data is stored by the Pokéwalker: https://bulbapedia.bulbagarden.net/wiki/Pokéwalker#Other_Pok.C3.A9walkers If this is to be believed, this would imply that the trainer data and entire party for the player is also stored by the Pokéwalker, because the game reconstructs a battleable version of the other player in the Trainer House. I suspect that would imply the Pokéwalker is capable of storing fully formed pkm data, rather than just partial pkm data, since it clearly can store an entire team of 6 from the player party.