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Since you want a singleplayer-like experience, you can use LAN to play Pixelmon locally with another player. Alternatively, you can host a multiplayer server yourself and install Pixelmon on it.
http://minecraft.gamepedia.com/Tutorial ... rge_server
Most of the steps are the same as making a normal Minecraft server. After that, the only extra steps are installing Forge and then Pixelmon.