This is how the Princesses transfer their magic to Ryan goes in Thunderwing's Revenge.
Princess Celestia: Thunderwing has stolen enough Unicorn magic that he now has the strength to steal flight as well. Without Pegasi to control the weather, there will be no rain in Equestria. There is word he has gone after Earth Ponies as well. Without their strength, they will not be able to tend the land.
Princess Luna: Ponies will no longer be in control of their world. That power will belong solely to Thunderwing.
Princess Celestia: There is no doubt that Thunderwing is after Alicorn magic.
Princess Luna: Once it is in his possession, his power will know no bounds, and all hope will be lost.
Princess Celestia: But there is one solution. It is only by making this sacrifice that Equestria and the lands beyond it might be saved. We must rid ourselves of our magic before Thunderwing has the chance to steal it from us.
Princess Luna: Thunderwing is set on possessing Alicorn magic. When he comes for us, we cannot have what he is looking for.
Ryan F-Freeman: Right.
Princess Celestia: Now's the time.
Princess Luna: We can't keep the magic in us any longer.
Princess Cadance: Let's do it.
Twilight Sparkle: You ready, Ryan.
Ryan F-Freeman: [takes a deep breath] Ready.
[As the princesses transfer their magic to Ryan, his eyes turn white and his hair grows longer and wavy]
Thunderwing: Now to steal the Alicorn magic.
[Back at the Canterlot Castle, all the princesses' magic is now in Ryan]
Princess Celestia: We did it.
Princess Luna: Keep that magic safe, Ryan.
Princess Cadance: At all costs.
Twilight Sparkle: No matter what you do, don't give it to Thunderwing.
Crash Bandicoot: Ryan? Are you ok?
Ryan F-Freeman: Yeah.
Doctor Crash: What happened to your hair?
Ryan F-Freeman: I think it may have some changes. My hair is wavy and long.
[Doctor Crash gasps and feels Ryan's hair]
Evil Ryan: Wow! You look like an equal of Celestia and Luna.
Ryan F-Freeman: I can feel their magic in me.