Having trouble logging in because of the mismatched ID error? Jevilius has found the solution, though he can't get on the forums since he forgot his pass.
Here's the steps on how to fix the problem:
Step 1: Redownload Pixelmon (Note: Just download, do not replace the entire thing.)
Step 2: Go to your .minecraft folder (type %appdata% in your start search bar to get there). Delete the folder “Database.
Step 3: Copy the folder “Database” from the newly downloaded Pixelmon and paste it in your .minecraft folder.
Step 4: Go to the “Config” folder and open the “Pixelmon” file with notepad.
Step 5: CTRL + F and search for “database”.
Step 6: You will now see: "Check for database updates"=true
Step 7: Change true to false and save the file.
Step 8: Close the folders and start Minecraft, now the game will work as it should.
Step 9: Have fun!
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