How do you get bason in shaman king legacy of the spirits soaring hawk?

Talk to Horo. When you get further along in the story you will reach the Mountain Village during the questline. At the Mountain Village, you can talk to Horo.

Complete side quests. This character will give you a series of side quests to complete and will require your spirit to help with his problems.

Recruit Lyserg Diethel. As soon as you finish all the side quests and defeat the final boss, Lyserg will show up and give you Bason.