I am already sending Garro your way. I have the same power. But...
"But if you do that, he'll become a Void Shadow. Is that right?" Owen asked, looking up.
...Yes. If I use my powers on Mewtwo as he is... he will reduce to a Void Shadow. A lost spirit. That is what they all are, after all. But... it would help him recover. It may take a long time, though, for him to come to anything close to what he used to be, if that. A time measured in years or more.
Fading, fading, and it didn't look like a ball was going to work. It didn't react, either because the Voidlands wasn't operating in the same way, or because the other ball was still active.
Mewtwo reached toward Brisa and held her on the shoulder. It didn't look like he knew what he was doing at first. He only stared at her; there was no Psychic pull, no presence of corruption, nothing at all. But then he held Brisa's shoulder a little tighter--and she'd feel his grip fade. Not because he was weakening, but because his fingers were just a haze.
He's scared, Owen reported darkly. I think he's realizing what's happening.
Garro emerged from a nearby tree--the Gengar disappeared underground again, reappearing a few paces away with a dark power flowing around his claws. He was glancing up, expression a pensive frown. He was speaking with Diyem about something.
"Try it," Owen said to Brisa. "Nothing to lose, right? Voidlands is a semi-plane--material and immaterial. I think if we take him into the stone here, it'll carry over to the living world, too."
No words, no thoughts, only a feeling. Mewtwo was barely able to hold his spirit together, and he was finally afraid, yet he had no power to do anything. If they did nothing, he would be gone in a matter of minutes, perhaps less.