If you have the bug of Male Nidoran do the next
Mi english is bad XD
1) Download the file Map021 and save it in the folder Data.
2) Run the game
3) Exit of Oceana Pier and back for the data refresh.
4) Fixed.
The problem is that doesn't exist a Pokemon called NIDORAN in the game files but there are NIDORANmA and NIDORANfE
Map021.rxdata