Please download and install Java 8 "Windows Offline (64-bit)" if you have Windows!
If you are unsure, you want to download the Windows version! (unless you have a Mac)
If you are using MultiMC for the first time, the quick setup will help you set your language and Java executable. If your PC got more than 3 GB RAM, increase the maximum memory allocation to 2048 MB!
If you are unsure, you can just click the "Next >" button!
https://playpixelmon.net/dl/PlayPixelmon.zipClick OK to start the download!
If you are using MultiMC for the first time, it will ask you to add your Minecraft account!
Answer to "Yes" to add an account now, then click on the "Add" button (top right side), then specify your email (or username if you have an old Minecraft account) and password!