>>57029021For a Japanese kid this is considered cool, for an older Japanese audience it is a clear parody of 8th grade syndrome. We as a western audience can only see it as an eccentricity, think of the first time you saw the Ginyu forces. Another theory is that Yokai Watch being a successful series at that time in Japan, GF will try to copy its concept to attract the child audience.
Contextually they could have justified it with some kind of bracelet that he uses to control Silvally but this will cause him pain due to a neural link, a cliché concept but one that works.