>>58985268There are multiple, but this one is connected to a different legend.
Hundreds of years ago there were three "ancient adventurers", Lucius, Gibeon, and Rystal. Each possessed a legendary Pokemon as their partner; Lucius owned the shiny Rayquaza, Gibeon owned a shiny Zygarde, and Rystal owned a Terapagos. Over the course of their adventurers they encountered an oasis of Pokemon, high in the mountainous highlands, and named it Rakua. Investigating deep within the paradise, they found massive amounts of mysterious pink crystals that seemed to have life-altering properties, and deemed this "Rakurium". Lucius and Rystal realized this was dangerous, but Gibeon thought he hit the jackpot, and wanted to use the Rakurium to change the world. Lucius fought Gibeon and repelled him out, and to keep the Rakurium from corrupting the world released his Pokemon and asked Rystal's Terapagos to create a barrier to seal in the Rakurium forever. Lucius chose to be sealed too, to keep an eye on it. The effort caused Terapagos to expend all its energy, and it returned to its dormant state as a crystal pendant.
Meanwhile Gibeon, who had taken some Rakurium before he fled, used it to extend his life. He still sought the mothercrystal deep within Rakua, but needed Terapagos to undo the seal to get it. He founded an organization called the Explorers to seek out and recover Terapagos, and had a child with some girl, who then had a kid named Amethio. Gibeon raised Amethio to be his successor.
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