Chandelure is pretty amazing: awesome sprite, even more awesome special attack, acceptable defenses, middle area speed, and decent HP.
Now for movesets:
Choice Sweeper
Item: Choice Scarf/Choice Specs
EVs: Special Attack: 252, Speed: 252, HP: 4
Ability: Flash Fire/Shadow Tag/Flame Body
Nature: Modest
Moves: Heat Wave/Flamethrower/Fire Blast/Overheat
Shadow Ball
Energy Ball/Solarbeam
Psychic/Hidden Power Ice/Hidden Power Fighting
Since this is a choice set, you want a high enough speed to hit many opponents first and a high special attack to eliminate opponents quickly. The HP stat is to let you live a little bit longer. Pick a fire-type move for STAB, this choice is really about power vs. reliability. Heat Wave is slightly more powerful than Flamethrower and can destroy opponents in double and triple battles, however it is less reliable with only 90 accuracy and only has a 10% chance at burning. Fire Blast is more powerful, but much less reliable with 85 accuracy. Flamethrower is powerful and still has 100 accuracy. Overheat is perfect for a choice set because the goal is to switch in, eliminate a threat quickly and get out. Staying in after using Overheat is not really an option, though, so use at your own risk. Shadow Ball is amazing: gets STAB, hits Ghosts and Psychics, all in all a good move. Energy Ball removes the turn for charging when it isn't sunny but go for solarbeam all the way on a sun team. Both moves hit major type threats: water, ground, and rock. The fourth move is all about coverage. Psychic leaves Flash Fire Heatran, Hydreigon, and Houndoom capable of resisting all your moves, but hits everything else at least neutrally. Hidden Power Ice hits dragons and Gliscor. Hidden Power Fighting hits darks.
As for the ability, Flash Fire gives three immunities (normal, fighting, and fire) allowing you to switch in very easily and gives your fire type move a boost if anyone hits you with a fire type move. Flame Body can cripple physical attackers by burning them, which is quite nice. Shadow Tag prevents your opponent from escaping.
As a side note, the decreased attack from adamant nature will keep you alive if the opponent uses Foul Play.
Other Options: Wise Glasses/Quick Claw
Wise Glasses works the same as the choice set, but you can change moves to suit the situation, allowing Chandelure to function even if the opponent changes. Basically eliminate the item, add Wise Glasses, and FORGET ABOUT OVERHEAT. On this set, Overheat will prove to be a VERY poor choice.
Quick Claw works like the other sets, but EVs should be eliminated from speed as you will rely on Quick Claw to act first. Take those EVs, dedicate them to HP so you live longer, and throw the other four into Defense or Special Defense. Once again: on this set Overheat == bad idea.