After Toyotomi Hideyoshi, the conqueror of the land, was killed by Tokugawa Ieyasu, Shikoku was attacked by the latter. Ieyasu succesfully conquered the island and Motochika had to flee. Motonari adviced Motochika to join forces with Ishida Mitsunari, the biggest enemy of Ieyasu. Motochika took this advice and joined with Mitsunari.
Role in Super Smash Sisters
Motochika Chosokabe is a wild NPC helper in Super Smash Sisters. He uses his anchor spear and wil sometimes kick his opponent. He will not hesitate to trap his enemies in a rope cage so the player can use it as a free punching bag before the opponent breaks free.