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Bonji (Japanese: ボンジイBonjī) is a character who appeared in I Choose You!. He is a researcher who spent many years of his life chasing after the LegendaryHo-Oh. He is known to have written a book titled Ho-Oh is My Life.
Bonji appeared in I Choose You!. After Ash, Verity, and Sorrel arrived at the Raizen Mountains, Bonji appeared and told them about the wild Pokémon residing there. He was searching for Ho-Oh for 20 years and saw that Ash had the Rainbow Wing. As such, he went with the group to where Ho-Oh was going to be.
After Marshadow was freed from the evil in the tainted Rainbow Wing and Ash was able to get a new one, Bonji advised Ash to place the Rainbow Wing on the rainbow rock. As a result, a rainbow formed and Ho-Oh appeared. After Ash battled Ho-Oh, Bonji then bade Ash his farewells.