PK4: Japanese Debug Pokémon Diamond Pokémon .

In June 2019, a Japanese copy of a Debugging variant of Pokémon Diamond Version was found and subsequently dumped.

When pressing down Select on the start screen, a debug menu appears. If the player opts to proceed with the debug start, instead of the standard way to start a fresh game,
the player will end up having 3 Pokémon in their party, namely: Infernape, Piplup and Finneon, all at Level 99.

It appears that it may be possible to shiny hunt these entries.
Special thanks to the @TheShadyRelapse for the speedy retrieval of these Pokémon.

As usual, these files would be illegal and should not be transferred. Use at your own risk.

[We will not distribute the Debug ROM, and it is against our rules to ask for it]