This is how Thunderwing vs. Daybreaker goes in My Little Pony Transformers Prime: A Royal Problem.
[Celestia stands on Canterlot Castle's balcony]
Thunderwing: Then, I'm back. [laughs evilly]
Princess Celestia: Don't worry, Starlight. I know how to handle Thunderwing.
[Suddenly, Daybreaker shows up]
Daybreaker: Yes! But can you handle... me?! [laughing evilly]
Princess Celestia: This can't be!
Daybreaker: If Thunder Streak can turn into Thunderwing, you can absolutely turn into me — Daybreaker! The better, prettier, and more powerful version of you!
Princess Celestia: No! I'll never turn into you!
Daybreaker: Deep inside, you know how powerful you are. You don't need Thunder Streak.
Princess Celestia: That's not true! Even when we were apart, I knew Luna and I needed him!
Daybreaker: [laughs] Oh, please! You don't need anyone! You can do whatever you want. And all you have to do is get rid of anyone who stands in your way!
[Thunderwing and Daybreaker start fighting]
Daybreaker: I never should've banished you to the moon! I should've destroyed you!
[She flies at Thunderwing as Princess Celestia and Starlight duck out of the way]
Starlight Glimmer: No, you can't do that! Day, night, sun, moon — Equestria needs both of you!
[They duck out of the way as Thunderwing fires]
Starlight Glimmer: Without balance, there's no harmony!
[Daybreaker pushes Thunderwing down but he throws her off]
[Daybreaker blasts Thunderwing with red energy]
[Thunderwing fires again and Daybreaker dodges]
Daybreaker: Who needs balance when you can have it all?! [laughes evilly]
[Thunderwing blasts Daybreaker away]
Thunderwing: You can't vanquish me so easily, princess, unless you plan on smiling me to smitherens!
[Daybreaker is about to charge at him again when Princess Celestia intervenes]
Princess Celestia: Enough!
[Thunderwing is knocked back as she jumps between them]
Daybreaker: [laughs] I told you I was more powerful than you!
[Thunderwing readies another cannon blast]
Daybreaker: Ugh. So much purple. We get it. You're sad. You could really use some... sun!
[She shoots a red energy beam at Thunderwing who encases himself in a forcefield as Princess Celestia ducks out of the way and the beam pushes the forcefield back. Starlight gasps as the floor piece beneath her is burned and Princess Celestia grabs her and encases them in their own forcefield. Daybreaker charges her energy as Princess Celestia and Starlight try to stand their ground]
Starlight Glimmer: It's all my fault. I never should've gone on this mission. Now Equestria is doomed!