What You Need
Dolphin 5.0-321 (Dolphin is updated very frequently. We only update when it benefits Smash/Netplay)
Melee 1.02 NTSC iso [no links/asking where to get one, you need to do this on your own]
Info on the new 5.0 Melee Settings:
Setting up Dolphin
*Note* If you followed the above Build/Guide, your Melee experience is ready to go. If you are an Advanced User, please double check all these settings.
Turn off Memory Cards by going to Options->Configure->GameCube.
Turn on Enable Cheats in Options->Configure->General.
Right click your Melee iso in Dolphin, click Properties->Gecko Codes and turn on the Netplay Community Settings cheat. This should be the only cheat on.
Playing on Netplay
Please follow the Netplay Guide
Here are some other reference guides in case you need any further help.