>>39609196You're so close yet so far away anon. Solar beam is the user gathering light and firing it at the enemy. Grass types are able to do this through a videogame form of photosynthesis. Fire types can produce light on their own. This is why fire types can use solar beam. Also, they could've made it a fire type move, but that would duck grass types by giving them one less STAB move and making it pointless to keep them out in the sun.
