I used to hate this PKMN but than PKMN CONQUEST came along and forced me to use it because my favorite Samurai used him. It is an Eagle not a Sparrow or Dragon but I guess they were trying to give him a PKMN that shows he cares about everyone and not himself. The Entry for this PKMN states that it will fight for it’s friends without caring about what injuries it gets during the fight.
For those that do not know Masamune protected the Christians after the War in Japan and when this was found out the Date Clan lost a good chunk of land. See reference to the PKMN. =)