>>58445240In Pokeworld, the second, while in our world Pyroar is a fictional creature created for G6, in his world it has existed for thousands of years, so probably a Pokechinene observed it or was informed of this by PokeMarcoPolo on his journey to the east where he obtained the cursed treasures.
But also "naturally", many fire Pokemon throw flames with this form, so probably in their world that is the origin of the kanji or ideogram