The way the Halloween Party at Canterlot and the Ghost Train's deal goes in Revenge of the Ghost Train.
In the Halloween Party.
Jack Skellington: Happy Halloween, My Friends!
Hiro: Happy Halloween to you too, Jack.
Princess Luna: Dusty, See to it that Princess Yuna will have a splndid Halloween with all of her friends.
Dusty Crophopper: No problem, Luna.
Princess Yuna: Mama?
Princess Luna: Yes, Yuna?
Princess Yuna: We need to talk.
Princess Luna: What is it?
Princess Yuna: I want to make sure my friends will have a great Halloween.
Princess Luna: Why's that?
Princess Yuna: You went to the Halloween Party at Dracula's Castle with Pooh, Ash and the others?!
Princess Luna: Yes, I'll see to you that you and your friends will have a great Halloween.
Princess Yuna: Thanks, Mama.
At the club.
Sunbeam: (looking through the telescope)
Teslo: What's taking so long?
Airazor: Be patient, Teslo, Yuna knows what she's doing.
Nyx: (looking at her watch on her hoof) This is gonna be the best halloween party ever.
Snowdrop: Zaptor, do not eat the sandwiches until Yuna comes back.
Zaptor: (trying to eat the sandwich) Oh, Right, Sorry
Princess Yuna: I'm back!
Tigatron: Where have you been?
Princess Yuna: I had to speak to my Mama for her support.
Airazor: And she gave it to you?
Princess Yuna: Yep.
Snowdrop: It's great to hear it!
Flain: I can hardly wait.
Zorch: What's your plan for Halloween now?
Princess Yuna: We're going Tick or Treating.
Krader: Yeah! Yeah! Rad fun!
Meanwhile, at Tartarus.
Rothbart: Brace youself, Sa'luk, Halloween is upon us!
Sa'luk: We'll have to take over by force.
Ghost Train: (whistles)
Tirek: What's that noise?
Rothbart: The Ghost Train!
Ghost Train: Hello, Tirek.
Tirek: Why are you here?
Rothbart: What business do you have with us?
Ghost Train: Revenge against the Ghost Train Busters.
Ghost Train: Here's the energy crystal, Tirek.
Tirek: (grows strong after touching the crystal)
Ghost Train: Feeling strong again, Tirek?
Tirek: Yes, Thanks to you.
Rothbart: Wow, What impressive ways to keep Tirek strong.
Queen Chrysalis: That was amazing!
King Sombra: My family and I are looking forward to our revenge.
Nightmare Moon: Yeah.
Nightmare Trix: Perhaps you could be of any help to us.
Nightmare Hiro: Yeah.
Ghost Train: What do you have in mind?
Tirek: With your help to gain our revenge, We'll help you with yours, What do you say?
Ghost Train: You got yourself a deal.