Leafeon are usually imagined to be a peaceful pokemon, content to lie in fields and meadows and soak up the sun's rays, and must often be goaded by their trainers before they even think of engaging in pokemon battles. But this passive lifestyle allows these pokemon few opportunities to eliminate excess energy; when they take in too much sunlight, they begin to radiate a magical light of their own. In doing so, the Leafeon not only heal nearby pokemon and cause plants to grow, but make themselves an extraordinarily tempting target.
Humans, with their remarkable technology and wide variety of sources of power, pay these Leafeon little mind, but for pokemon their very presence signifies a battlefield. The healed and invigorated pokemon soon use their newfound power fight with one another over the very Leafeon energizing them both, their minds swiftly conquered by greed. The reward for victory is not capture, for pokemon can not operate pokeballs without being captured themselves - instead, they eat the leaves which these radiant Leafeon shed after their energy is depleted, and in doing so claim a portion of their awesome power. At times, the battle ends in stalemate, and the few undefeated pokemon are forced to share the leaves, often after the Leafeon has moved on.
The Leafeon themselves were once thought to be passive bystanders in the vicious combat which always surrounded them, but this is very far from the truth. Leafeon do not subsist solely on photosynthesis, but like most animal-shaped grass pokemon also absorb soil through their feet, and the soil they utilize best, especially after shedding leaves that have taken in too much energy, is soil filled with pokemon blood.