According to the search results, only a straight flush or a royal flush can beat four aces in poker. Four aces is the highest four of a kind, and it is the most powerful of all poker combinations. However, a straight flush is five consecutive cards of the same suit, and a royal flush is a straight flush that runs from 10 to Ace. Both of these hands are rare, but they are the only ones that can beat four aces. It is important to note that the value of the cards does not matter when comparing different hands, and the highest card in the hand determines the strength of the hand.