Event 12: Sleeping in the Eggs
From SmashWiki, the Super Smash Bros. wiki
Sleeping in the Eggs (たまごの中でおやすみ, A Rest in the Eggs) is the 12th solo event match out of a total of 41 in Super Smash Bros. Brawl. In this event, the player must play as Yoshi and use Egg Lay on both Kirby and Pikachu, so that both are trapped in eggs simultaneously. Harder difficulties will cause Pikachu and Kirby to break out of the eggs faster, which makes having them both in eggs at the same time harder.