Casys finished his food and excused himself. He and Apollo took a walk back over to Nugget Bridge and sat down with their feet over the edge. "Apollo-," Casys said to his partner. "-Do you wanna try to Mega Evolve?" The Heracross nodded and together they walked to the side of the river. Casys replaced Apollo's Heracronite and together they began. "Apollo," Casys breathed, his eyes closing. Casys' Keystone began to glow a brilliant white light. Apollo's Heracronite began to glow the same color.
(OOC There is a lot of backstory on why they activate the Mega Evolution in such a way. I'm gonna be writing a story about their journey in Unova and that will explain it BIC)
Casys and Apollo's breathing sync up. They are in near-perfect harmony. Each bring their arms up in an "X", then they bring their arms down in an "O". They hold that position for a moment, then each of their arms snap out in an upside down "V". Tendrils of light erupt from their respective stones, overlapping and intertwining. Apollo is enveloped in a white light and, when it dissipates, he has Mega Evolved.
Apollo let's loose a roar, a purple light engulfing his eyes. "Oh, no-" Casys said before Apollo jumped into thee river, attacking all the wild Pokemon. Most of them try to flee, but the blue, serpentine Pokemon Casys saw earlier that day leaped out of the water. It's tail lit up, and it wrapped itself around Apollo's face. Apollo ripped the Pokemon from his head, then threw it into a tree. "Apollo, stop it!" Casys cried. Apollo looked into his eyes, the purple light leaving them for a moment. He was engulfed in a blue light, then he fell down into the river, his original form returned. Casys returned him to his Poke Ball, thhe could get to the Pokemon Center in timme.