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(if needed).  You'll need Java in order to download and play both Minecraft:  Java Edition and Minecraft mods.  If you haven't already done so, download and install the latest version of Java from https://www.java.com/ES/download/. You'll need the original Minecraft:  Java Edition game to install mods like Pixelmon.  Mods are not supported by Minecraft: Windows 10 Edition, or any version of Minecraft for game consoles or mobile devices. Use the following steps to download Minecraft: Java Edition:  Go to https://www.minecraft.net/en-us/download/ in a web browser. Click Download. Open the MinecraftInstall file in your web browser or Downloads folder. Minecraft Forge is used to install Minecraft Mods.  You need forge 1.12.2-14.23.5.2838 to install Pixelmon.  If you have a newer version of Forge, you don't need to uninstall it, but you will need to install Forge 1.12.2-14.23.5.2838 along side your other versions of Forge.  Go to https://files.minecraftforge.net/maven/net/minecraftforge/forge/index_1.12.2.html  Click the orange button that says Show all version. Scroll down to "14.23.5.2838" Click Installer-win for the Windows installer, or Installer for Mac. Wait 6 seconds and click Skip' in the upper-right corner.  "Warning: Adfoc.us may try to trick you into downloading malware and unneeded programs on your computer.  Do not click any other buttons or offers.  You will also need to temporarily disable any adblockers you have installed. Click the forge-1.12.2-14.23.5.2838 installer file in your web browser or Downloads folder.  If you accidentally download any other files besides this one from the adfoc.us website, do not open them.  Delete them immediately. Use the following steps to download the Pixelmon mod:  Go to http://www.9minecraft.net/pixelmon/ in a web browser. Scroll down to "For Minecraft 1.12.2" Try the other links if that doesn't work. After downloading the Pixelmon mod file, you can find it in your downloads folder.  Once it is located, either leave the Downloads folder window open or drag and drop the Pixelmon .jar file onto your desktop. Again, do not open any files you may have accidentally downloaded from Adfoc.us.  Delete them if you find them.

Summary:
Download and Install Java Download and install Minecraft: Java Edition. Download Minecraft forge version 1.12.2-14.23.5.2838. Download the Pixelmon mod from the modder's website. Click Download from Server 1 next to "v7.1.1". Locate the Pixelmon .jar file in your Downloads folder.