King of the Yoshis
From SmashWiki, the Super Smash Bros. wiki
King of the Yoshis (known as Battle of the Yoshis in PAL versions of the game) is a single-player event match in Super Smash Bros. for Wii U. In it, the player controls Yoshi, and must defeat seven other differently colored Yoshis in an 8-player stock match. Some of the other Yoshis have various custom moves. This event is played at Yoshi's Island.
This event is unlocked by clearing Playing Tricks. Completing the event unlocks the up path.
Completing the event while KO'ing at least 5 of the opponents awards an Insult to Injury Saddle equipment.