shoutmon and me travel a lot in time whit the "Time Shift" so we meet a strange boy that was a ninja he say and he teached shoutmon this technique the "Rasengan" :DD it was easy for him cuz he controles Ligthning, Fire and Wind.
Still the Rasen-Shuriken is a dangerous technque for the user for the cutting wind that is around the wind ball, thats why always shoutmon uses this technique he gets hurt in his arm.

__________________________________

Digimon, Shoutmon © Akiyoshi Hongo, Toei, Bandai