This is an IPS Patch for playing the extra courses online. You will need to use an IPS Patcher and patch a clean ROM with this file. I suggest IPS Win. Here is a link to the download:IPSWin2
Or when your player dies, you can say in code, if enemy exists, do nothing, but if enemy does not exist, then create enemy at certain spot. (This would be a pain tho for lots of emeies)