The 37-year-old southpaw returned to the ring after a seven month retirement to claim the WBO welterweight title by beating Jessie Vargas in Las Vegas earlier this month.
"I think about it, I can still fight and my body is still okay so I decided to come back and I'm here, my journey is continued," Pacquiao said in the Japanese capital.
The southpaw has a 59-6-2 win-loss-draw record and is the winner of world titles in eight different weight divisions and the first sitting Senator to win a world boxing title.
The new 'Pacquiao Gym', a collaboration with Japanese business man Yoshihiro Agata, will open in the new year and the Filipino said it was an opportunity to pass on his experience.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
"(I opened this gym) to help the people to do exercise and also...to discover a good boxer," Pacquiao said.
"I can share my knowledge about boxing and my talents. I can teach them."
(Reporting by Reuters TV. Editing by Patrick Johnston)
