Here is how Princess Yuna tamed the I-Rex in Genesis World.
Later that night, All the visitors evacuate from the island.
Princess Yuna: The island has been evacuated and the Piranhaconda didn't follow anyone ore anypony.
Princess Skyla: But what're we going to do about the Piranhaconda?
Oh: It was going to hurt everyone and everypony.
Prince Edmond: There must be someway we can do.
Then, Yuna came up a plan.
Princess Yuna: Alright, Gang. You all know the plan.
Snowdrop: Okay, Yuna.
Princess Sharon: I'm with you, Yuna.
Princess Yuna: Thanks, Sharon.
Moon Starlight: Same goes for me.
Later, Skyla and the Royal Crusaders set the cameras on the four Velociraptors and the T-Rex. The hunt is on, Yuna was on her Motorscooter and the Predators followed Yuna.
Princess Yuna: Time to save Genesis World!
In the jungle, Yuna spotted something.
Princess Yuna: I think they found something.
Just then, Dawn came from her camouflage.
Snowdrop: What was that?!
Sunbeam: It's Dawn!
Dawn was about to devour when Yuna came forward.
Dawn: (growls and communicates with the Raptors)
Douglas: (growls and communicates)
Blade: (growls and communicates)
Princess Yuna: Those raptors are communicating with Dawn.
Princess Yuna: Don't you all remember? She's part raptor!
Dawn: (staring at Yuna)
Yuna stood up to Dawn and started taming her.
Princess Yuna: Dawn. Easy, Girl.
Princess Yuna: I won't hurt you. We're friends. Piranhaconda is not a friend.
Dawn: (begins to understand Yuna)
Suddenly, The Piranhaconda is coming up behind Skyla.
R.J.: SKYLA! BEHIND YOU!
Princess Skyla: (looks behind)
The Royal Crusaders: SKYLA!
Princess Skyla: (screams)
Dawn: (roars and snatched Skyla away with her claw)
Pirahnaconda: (missed Skyla and slithered away)
Dawn: (shows herself from her camouflage)
Princess Skyla: It's okay. I'm alright.
Dawn: (makes a gentle growl)
The Royal Crusaders: Whoa!
Princess Yuna: (pets her) Good girl, Dawn.