Gyarados, use Twister!
Through Gardevoir's Telepathy, Xia You gave Mega Red Gyarados his first formal command in his mind.
Upon receiving his command, Mega Red Gyarados plunged into the lake. As its enormous body churned, its power drew forth a massive tornado that instantly formed in the center of the battlefield!
The fierce winds rolled up the dark clouds!
Compared with the Twisters unleashed by other Pokémon, this tornado, like Mega Red Gyarados itself, was larger, thicker, and far more destructive!
Whoosh... whoooosh...!
The wind howled as the merciless tornado rampaged about, ravaging everything around it.
Rocks flew everywhere, and trees were torn out by their roots!
Faced with such power, many Pokémon were helpless to resist. They were either swept straight into the tornado or buried beneath the rubble.
What incredible destructive power...
Misty watched from afar with wide eyes. She stood stunned for quite a while before belatedly taking out her Pokédex and pointing it at Mega Red Gyarados.
Pokédex: "Beep. Mega Gyarados, the Atrocious Pokémon. Water and Dark type. Mega Gyarados's body undergoes tremendous strain during Mega Evolution, and the stress makes it rampage ever more violently. It sprays water from the jets on its sides to fly along the water's surface at speeds exceeding the speed of sound. Even a large ship caught in its path will be snapped in two. Although its instincts drive it to destroy everything, it will also obey a Pokémon Trainer it truly trusts."
She had also upgraded her Pokédex upon arriving in Hoenn. She had only scanned it casually to give it a try, never expecting it to actually display relevant information!
Fortunately, this gave her a much clearer understanding of Mega Gyarados!
In particular, she also noticed a sparkling rough stone hanging beneath Mega Red Gyarados's neck.