>>14814410Actually it does, in the post game Sycamore explains that the Mega stones were other types of stones like Fire Stones or Shiny Stones that were altered by IIRC Xerneas' power many years ago. The Mega items (Mega Bracelet, necklace, etc.) emit a wavelength that matches those mega stones and the Sun Dial in Ainstar ciy. This reaction is what causes certain Pokemon with hidden power to Mega Evolve
