What if Emziko was Canon?

"So, let me get this straight: Apperently, dragons can smell changelings coming a mile away because they used to want all dragons dead like super long ago, and in the case this last remaining hive ever showed it's face again, all dragons know how they smell by birth, and they specifically smell like burnt cockroach." Rainbow Dash said. "How close am I?"

"While that is a basic summery of what we just told you..." Spike began.

"It's basically correct." Emziko said.

"Okay. So, kind of a stupid question has just came into my mind..." Rainbow Dash said.

"Stupid is kind of an ugly word so please--" Emziko began.

"Can either of you smell burnt cockroach now that Cadence has left?" Rainbow Dash interrupted.

Upon that, Emziko and Spike then realized something. "...Huh. Now that she mentions it..." Spike said.

"So, that wasn't the real Cadence?" Twilight asked. "But she looked just like her..."

"It's most likely one of the changelings. Given Cadence's status as an alicorn Princess, it's likely the queen of the hive." Emziko said. "But since we know she's not the real Cadence, we can use that to our advantage."

"Err, how so?" Applejack asked.

"I think I know: The six of you can distract the disguised changeling; make her think we're going along with the wedding. Meanwhile, Emziko and I can go find the real Cadence." Spike said.

"Err...well...that's...actually a much better plan then I had in mind..." Emziko said. Once again, Spike showcases why Purple Dragons are in such high regard.

"Well, the best part is, because that changeling; queen or not; used Cadence's face, you both know exactly what the real Cadence looks like." Twilight said.

"So, the two dragons are going to go find the real Cadence." Applejack said. "Ah really don't like the fact that ah'm going to have to lie to the changeling's face..."

"You're going to have to make that sacrifice AJ; these Changelings don't play by our typical rules." Rainbow Dash said.

"...Point well made." Applejack said.

"If that is the queen, then I can actually get justice for the ponies she had her changelings kidnap. If it's just some drone, they can be grilled into giving up the hive's location. Either way, that hive's queen is going to be facing the concequences of her actions." Emziko said.

"Your not going to kill her though, right?" Twilight asked.

"Nah. That's going to be up to Princess Celestia if the queen lives or dies. I think it'd be much more ironic that way." Emziko said.

The entire main six blinked. "Remind me not to get on your bad side." Rainbow Dash said.

The Main Six began to distract the fake Cadence with the wedding preperations. Meanwhile, Spike and Emziko somehow found their way into the caverns underneath Canterlot Castle. "I honestly didn't think this place was real. While I was staying with Celestia when I was just born, she told me that there were secret caverns underneath the castle. I honestly believed they were just some myth to scare me into being good, because I thought the dungeons were the lowest part of the castle." Spike said. He then looked up as he and Emziko searched for the real Cadence. "In fact, the dungeons are right above these very caverns."

"Maybe you should suggest Celestia turn these caverns into part of the dungeon once we capture the changeling queen." Emziko said.

"I don't know; part of me thinks that these caverns should remain a secret." Spike said. "How many folk would you say know about these caverns in the first place?"

Emziko opened her mouth to counter, but then she realized that Spike was right. "...That's a surprisingly good point. I think the fact that the caverns aren't well known about is the reason why they work." The green dragoness admitted.

"Is someone there?" A female voice asked. The two dragons found what appeared to be Princess Cadence.

"Are you, Princess Cadence?" Spike asked.

"Mmm...well, the good news is, she certainly doesn't smell like burnt cockroach. She still smells, just not like that." Emziko said. "I'd certainly say this is the real Princess Cadence."

"Sorry, I've been trapped under here for a few days now. We've got to get to the wedding; the Changeling Queen has impersonated me, and plans to use my form to drain Shining Armor of both his strenth and his love." Cadence said.

"So then the other Cadence we met was the queen disguised as you." Emziko said. Suddenly, she noticed a heavy smell. "Ugh...something else reeks down here."

Nearby, was what seemed to be a strange yellow and blue bug-like creature with strange orange antlers. "Dragons...it had to be dragons. Not that that matters right now." He said.

"Huh. You look strange. You don't smell of burnt cockroach like the changelings. What are you?" Emziko asked.

"Actually, I am a changeling." The bug-like creature said. "The smell your probably familiar with for changelings though, is what happens when Changelings are starved for love."

"So wait, then why do you smell so different?" Emziko was now very confused.

"Because not all the changelings were killed in the war. Many hives fled to other regions of the world." The Changeling said. "It was there that we discovered that if we gave love instead of taking it, we'd no longer need it to survive. And when we did, we turned into more vibrently colored forms. To the point, where we would easily be mistaken for a bug-pony."

"So...wait...there's good changelings and bad changelings now." Spike realized. "That must mean, that the changelings that smell like burnt cockroach are the bad ones."

"Well, I guess if your not like the changeling hive that was left behind in Equestria, you got nothing to worry about." Emziko said.

"The last changeling hive that exists in Equestria, is ruled by the very changeling that is responsible for that war happening in the first place." The Good changeling said. "Her name...is Queen Chrysalis."