Since Pixelmon's download page has been taken down, you can now download Pixelmon here!
Pixelmon Reforged is a continuation of Pixelmon by many of the original developers.
Minecraft Version: 1.12
Pixelmon Generatiins is a community-made continuation of Pixelmon with new Pokemon added.
Minecraft Version: 1.10.2
Requires Minecraft Forge. Download here
Minecraft Version: 1.7.10