For context, they managed to successfully accomplish an impossible task (defeating a Lich with it's minions) to save their tribe's armoury and magical item stash. So their master, an Ancient Red Dragon, will give them an item from his own collection
Not sure what your question is. The item only applies it's benefits to those that match it's patron's alignment exactly, including the attuned characters enemies. A Chaotic Good Character gains no benefits from a Chaotic Evil's Candle, but Goblins or Kobolds might, to say nothing of Demons or Chromatic Dragons.
Not sure if it still exists in 5e but back in my day there was a skill that would allow you to activate a magic item you normally couldn't, including spoofing your alignment.
So a CG trickster cleric could conceivably BS the candle into letting her get its benefits. Including being able to Gate in a Genie...
Edit: Also, if it's sitting around in a red dragon's collection, it probably doesn't match his alignment, or he would've just used it himself.