The Shashmon+ modpack is a 1.12.2 modpack that has several mods to improve Pixelmon free play. It essentially combines the Pixelmon Reforged and Life in the Village modpacks with the Pixelmon Peridot map.
Please use the existing map to play, or the story / puzzle adventure mode won't be available.
We recommend duplicating the existing world and playing on the duplicate. This allows the original map to remain unmodified for future plays and protects the original map from data loss.