You will need a paid version of Minecraft to follow this guide as well as a computer with 2GB of free RAM
Pixelmon is compatible with the following versions of Minecraft:
Minecraft version 1.10.2 and Pixelmon version 5.1.2 are recommended as the other versions are not updated.
We are going to install Pixelmon using Forge
Use the Pixelmon Download Page to choose the right version of Forge based on your Minecraft Version
Once you have downloaded the Forge Installer, double-click on the installer and run as "client"
When Forge installation has completed, open your Minecraft launcher
At the very top select Launch Options
You will either need to add a new profile or edit an existing one
From the drop down box that says Version you should selected the option named after the Forge installation you just installed.
Save your profile
Now go ahead and start up Minecraft. It should load with no problems.
We are done, but before you proceed, you should double check the bottom left corner of the main menu and make sure the version of Forge you downloaded is showing. If so, you have installed Forge correctly.
Now we are ready to install Pixelmon
You are almost ready to start playing the best Pokemon Minecraft mod ever!
Note: Minecraft must be closed to proceed with Pixelmon installation
Okay to start off we need to download the version of Pixelmon that is compatible with your version of Minecraft by going here.
Next open the Minecraft launcher and select the profile that you just installed Forge with.
Find the game directory box and click on the green arrow next to it to open the Minecraft game directory folder. You could also use Windows Explorer but for the sake of simplicity, we will just do this.
In the game directory, you should see a folder named mods. If not, just create it.
Copy and paste the Pixelmon jar file inside the mods folder.
Hit the Save button
Switch to any other tab and start Minecraft
Pixelmon should now be installed! To double check check the Mods section in the main menu. You should see Pixelmon listed there as well as any other mods that you have installed.