Sir Aaron

Legend
Sir Aaron is a legend of the Hoenn region. He was born in Cameron Palace and was a noble and honored knight. When two armies were about to fight, Sir Aaron went to the Tree of Beginning and sacrificed himself to save the kingdom. He has the ability to use aura, along with his friend Lucario, whom he traveled with.He could be the ancestor of Riley a trainer in Diamond, Pearl, and Platinum that gives you a Riolu, or possibly Riley is his reincarnation.

Trivia

 * Lucario mistook Ash for Sir Aaron once.