Young Link

Young Link was Marth's best friend and used to be one of Mewtwo's apprentice.

The Young Fool
Young Link used to be train under Mewtwo with his best friend Marth at Hyrule Temple. One day Young Link was teasing Marth about his size when Mewtwo appeared announcing that their rival Shadow has set up a base in New Pork City. Young Link wants to go there and defeat Shadow, but Mewtwo tells him not to. Mewtwo leaves and Young Link ignores Mewtwo and heads off to Shadow's Base anyway. At Shadow's Base Young Link arrives and Marth arrives also and they over hear Shadow's evil plan. Young Link speaks out and Shadow hears them and teleports to their location. Shadow asks who they are and Young Link tells them they're here to deliver his domino's pizza. Shadow teleports inside his base to get his wallet. Marth tells Young Link they should leave, but Young Link decides to get the Morph Energy Ball instead. Young Link grabs the Morph Energy Ball and is about to leave with Marth when Shadow shows up and realizes he's been tricked. Shadow touches the Morph Energy Ball from Young Link trying to take it from him, when something bad happens. Since Young Link and Shadow were touching the Morph Energy Ball at the same time they were morphed together into a evil warrior. Dark Link.