Relic Song (いにしえのうた Ancient Song) is a move that can only be learned by talking to the man who carries a guitar in Castelia City and can only be taught to Meloetta. If Meloetta uses this move, it will change between Aria forme and Pirouette forme each time it is used. This move can only be taught to Meloetta from an event.
Relic Song deals damage and has a 10% chance of putting the target to sleep. Relic Song hits all opponents in double battles and hits all adjacent opponents in triple battles.
The user sings an ancient song and attacks by appealing to the hearts of those listening. It may also induce sleep.
When used by Meloetta in battle, it will also cause it to change between its Aria and Pirouette Formes.