This is how Tritannus discovers that the throne's legs are broken and the Winx, Autobots, and Ponies' training goes in My Little Pony Transformers Prime Winx Club: The Pillar of Light.
[The film starts with Starscream flying through the Infinite Ocean]
Starscream: Come on, where is he?
[He sees Tritannus sitting on the Emperor's throne]
Tritannus: I've been waiting for you.
[Starscream transforms to bot mode]
Starscream: Rumor has it that you tried to take the crown from your brother.
Tritannus: But still he was chosen.
Starscream: Yet the throne still doesn't work.
Tritannus: What is wrong with this thing?
[He swims down and sees the throne's legs are broken]
Tritannus: I see the legs of the throne. They're broken!
Starscream: What do you suggest we do to restore them?
Tritannus: I think I know one way.
Starscream: And that is?
[Meanwhile, the Autobots, Winx and Ponies are training]
[They swim through the Infinite Ocean, basically a simulation]
Optimus Prime: Okay, we just need to find the Coral Circle.
Twilight Sparkle: It must be down here somewhere.
Sideswipe: Yeah, the only question is where?
Arcee: Maybe, if we concentrate hard enough, we should be able to sense where we need to go.
Rainbow Dash: Yeah. You're right, Arcee. Come on, you guys.
[The Autobots, Winx, and Ponies concentrate and Bumblebee senses something]
Bumblebee: I think... [gasps seeing something] Look!
[They look down and see a path]
Sideswipe: A path.
[They follow it]
[They find the Coral Circle]
Optimus Prime: There it is.
Twilight Sparkle: Come on.
[They swim towards it]
[A light happens]
Pinkie Pie: Faster!
Smokescreen: Move it!
[They move faster]
[The creatures move towards them]
Fluttershy: Watch out!
Ratchet: Look out!
[Sideswipe is frozen in place]
[The simulation disappears]
Rarity: Well, that didn't go so well.
Bumblebee: What happened, Sideswipe? Why couldn't you move?
Sideswipe: I don't know. I just froze.
[Miss Feragonda's voice comes over the P.A.]
Miss Feragonda: (voice) Meet me in the control room, girls, and Autobots.
[They head there]
[Miss Feragonda turns]
Miss Feragonda: What happened, Sideswipe?
Sideswipe: I don't know, Miss Feragonda. I just froze.
Miss Feragonda: I see. And this was only a slight imitation of the challenges you will face in the Infinite Ocean. Sirenix is a great power and as such it requires great strength and will to master. You must find that strength inside of you, Sideswipe.
Sideswipe: Yes, Miss Feragonda.