I've just spent a few days trying to beat a Level 1 game (though it displays as 50 to stop you from gaining PP and leveling) so I could unlock the Infinity Mode with it. Here is the save, included is also a Level 50 save with everything unlocked.

{LINK REMOVED}https://www.mediafire.com/file/9gz3agdhzn5ujd7/remote.7z/file

Put these in the Steam\userdata\#\427190\remote folder for it to pick up. :)