Shiranui was next to challenge Brawly.  After hearing the recital familiar to every gym, Brawly sent Machop out.  "Kinoko, I choose you!"  Shiranui sent his Shroomish out.
"Begin!" called the official.
"Machop, Bulk Up!"
"Kinoko, Leech Seed!"  Machop's muscular body piled on more muscle, boosting its physical stats before Kinoko fired a seed.  The seed struck home and Machop was ensnared by vines that started sapping its energy away.  Kinoko's Toxic Orb activated, leaving the Shroomish badly poisoned, but thanks to her Poison Heal ability, was not fazed by the poison.
"Machop, Karate Chop!"
"Kinoko, Mega Drain!"  Machop demonstrated some martial arts movements before delivering a swift karate chop to Kinoko.  Kinoko drained more energy away from Machop and healed back half the energy drained away plus more from the poison and the Leech Seed.
"Impressive combination you have there, Shiranui," commented Brawly, "Machop, Seismic Toss!"
"Kinoko, finish it off with Mega Drain!"  This time, Kinoko was first to act as she drained more energy away.  Machop barely survived the attack, but Shiranui knew it would not take long for Machop to fall.  Machop grabbed Kinoko, jumped high into the air and body slammed her to the ground.  The Leech Seed drained away the last of Machop's energy and the martial artist was down for the count.
[hr]"Machop, return; go Hariyama!"
"Kinoko, return; Gimansha I choose you!"  Both battlers switched their Pokémon.  In Shiranui's case he sent his Mawile out.
"Hariyama, Sand Attack!"
"Gimansha, Taunt!  Mega Ring activate!"  Shiranui activated the keystone on his Mega Ring and an orb of energy surrounded Gimansha.  The orb shattered to reveal a Mega Mawile that made a come-hither motion, causing Hariyama's attack to fail.
"Hariyama, Arm Thrust!"
"Gimansha, Play Rough!"  The Mega Mawile started pouncing about and playing roughly with Hariyama.  Hariyama barely survived the experience and managed to deliver a salvo of arm thrusts that were little more than glancing blows.
"Hariyama, Vital Throw!"
"Gimansha, Bite!"  Gimansha looked cutely at Hariyama and at the right time, bit down with both her steel jaws, knocking Hariyama out.
[hr]"So that was the awesome power of Mega Evolution," stated Brawly, "For your prowess in battle I award you the Knuckle Badge."