Fake Sinnoh is a duplicate of the actual game map that can be accessed by Tweaking or the Surf Through E4 Door (Jap). It is extremely glitchy and caution is advised when exploring, because in the Void and (I believe) Fake Sinnoh, one wrong move can trap you.
I have never been to Fake Sinnoh before- this is what I have found researching it.
:D
Chat with our AI personalities
In Diamond & Pearl's version of the Sinnoh Dex, Pokémon #149 is Dialga.
on the sinnoh pokedex its the Pokemon wormadam
weavile
Uxie
diamond pokedex number 80 is Barboach