You can play BSMC Pixelmon by adding the server in the Minecraft launcher.
On Minecraft Bedrock Edition, open the Minecraft launcher or Minecraft app. Go to the “Servers” tab and press “Add Server.” Enter the BSMC Pixelmon IP Address pixelmon.blackspigot.comin the “Server Address” and the BSMC Pixelmon port 19132 in the “Port.” Then press “Save” and start playing.