Actually, energy ball is a bad choice for Chandelure. Unless you are facing a Ground-Water pokemon, a supereffective energy ball (power 140) is a little more powerful than a normal power shadow ball (120). I prefer using Solar Beam on my Sunny Day team. But if you don't have a Foretress with Spikes, Toxic Spikes, Stealth Rock and Sunny Day, then energy ball is a good choice.