Personally,in most movies from pokemon, Ash and the highlight legendary icon are the stars. But on this movie, Masato (Max in America) [known as May's Sister] leads the movie with Jirachi (in my personal opinion, a charming little legendary). The beauty is that it implements about the beauty of friendship on the early days, the middle days, and the day of separation. It's like something to compare with in school life. Meet them, enjoy the months, and bidding goodbye after graduation. Minus the Graduation hats and diplomas. No matter how long or short the days, moths, or years last, the relationship between the intellectual Max/Masato andthe kindhearted Jirachi the wishmaker (the gender is up to you to decide. But its a girl for me), it nicely implements as to how a powerful friendship lasts a lifetime. In the movie's case, it also shows a mildly dark reason in the near end of the movie on the value of letting the most treasured things go.

If you want to take your brain's imagination to the next level, you could compare Max and Jirachi's friendship to that of Ash and Latias' relationship. (this one is optional)