Who can learn Solar Beam?

Who exactly is capable of mastering the enigmatic Solar Beam? Is it a skill reserved solely for the most adept trainers, or is it accessible to those with a keen eye for the sun's power? Are there specific prerequisites that one must fulfill before unlocking this celestial technique? Does it require an innate connection to nature, or can it be taught through dedication and practice? And perhaps most importantly, what sets apart those who can wield Solar Beam from those who cannot? The question lingers, intriguing those who seek to harness the power of the sun.