Shiranui had yet to return as he was following Zoku while the Thievul sniffed around for the scent he picked up of Max Mushrooms back at the dojo.  They found themselves in the Forest of Focus and with Nekomata floating around as lookout, Thievul pointed like a hunting dog at a tree stump and within a hollow in that stump were three Max Mushrooms.  "Nicely done, Zoku," Shiranui praised as he picked the mushrooms.

Avery teleported in with his Kadabra and shouted, "Hold it right there!  Hah!  Just as I expected!  Multiple Max Mushrooms growing in a bunch!  My psychic powers picked up on these Max Mushrooms aeons before you found them.  I believe I should be the first one to get those Max Mushrooms.  First come, first served, and all!"
"You're absolutely right," Shiranui rebutted, "First come, first serve—I came here first so I get the mushrooms."
"You dare get in my way? I warned you about my psychic powers, and now you'll experience them firsthand!" Avery challenged, "Kadabra, Psychic Terrain!"  Before Shiranui could send out his battler the battlefield got charged with psychic energy.
"Alright, I'll show you how a [i]real[/i] psychic battles," Shiranui responded, unmoved by Avery's threats, "Saisei, I choose you!"  He sent his Mewtwo out and Kadabra almost immediately felt the pressure from Saisei's glare.
"Kadabra, Swift!"
"Saisei, Laser Focus!"  The Mewtwo locked on to Kadabra's weak spot with laser-like precision while Kadabra shot a salvo of star-shaped rays at Saisei and landed a hit.
"[i]Was that supposed to hurt?[/i]" Saisei asked, "[i]Hailstones do more damage than that weak excuse for an attack.[/i]"  Avery felt both dumbfounded over how little damage his Kadabra's Swift did and riled up by Saisei's comment.
"Kadabra, give it a Tri Attack!"
"Saisei, use Psystrike!"  Kadabra fired off three beams that formed a delta and Saisei copped a Flamethrower, an Ice Beam and a Thunderbolt at the same time.
"[i]Passable, especially with the odds of leaving me frozen,[/i]" Saisei patronised, "[i]You might have stood a chance then, but it's now time to feel real power![/i]"  The Mewtwo launched a wave of psychic energy at Kadabra powered up by the Psychic Terrain.  In spite of the attack not being very effective, Kadabra was knocked out thanks to a large disparity in experience, a very low Defence stat and a critical hit made certain by the Laser Focus from earlier.  "Compliments of Mewtwo—the world's most powerful Pokémon," Shiranui finished.

"Blast it.  Victory still eludes me…  What is it that I lack?  What do I need?  Very well, you can have those ones.  I'll go and find myself some Max Mushrooms that are far more elegant!  Avery, Teleport!"  Before Shiranui could answer, Avery and his now-revived Kadabra vanished from the area.
"[i]The answers he seeks are so obvious even the local Slowpoke can figure them out,[/i]" Saisei stated.
"No doubt about that," Shiranui agreed, "Saisei, Zoku, return!"  He recalled his Mewtwo and his Thievul.  "Nekomata, can you fly us back to the dojo?" he asked.
"[i]Can and most certainly will![/i]" the female Meowstic affirmed, grabbing her trainer in a telekinetic hold and the duo floated back to the dojo.

"I return with three Max Mushrooms," he announced, handing the mushrooms over to Mustard and recalling a blushing Nekomata.