He tilted his head, studying the crown intently before suddenly clapping his hands together. “Eureka!”
He spun round, expression beaming. “Have a swap meet.”
“What?!”
“Have you and your friends ever tried swapping your Elements with each other and seeing if you got a response?”
“Well, Applejack and Rainbow Dash have a lot in common, so Loyalty and Honesty might–”
“No,” he shook his head. “Don’t go for the obvious route. Randomize it. You put on the Honesty necklace, then.”
He picked up the Crown and twirled it on one finger. Twilight would have screamed for him to stop defacing a priceless relic were she not captivated.
“What happens”, he queried aloud. “If we anointed Pinkie Pie with this thing, and stuck her necklace on you?”
“Well, I…” she stammered, before pausing and sighing. “I don’t know. I admit it, I don’t know what would happen.”
“Congratulations, you’re the new Element of Honesty.” he said sarcastically. “There’s no point to us debating how these things can be used against the enemy, if we don’t already know WHY they work at all, because it seems to me that either these pieces of bling will work with any pony, or there is some kind of intelligence at work here ensuring they only ‘click’ with individuals who meet the right parameters...”
https://www.fimfiction.net/story/42449/28/the-conversion-bureau-the-other-side-of-the-spectrum/second-month