Shiranui had an idea as to what Liam was trying to do.  "Saisei, I need your help!"  He called his Mewtwo out.  "I need you to help us keep these two distracted!"
"[I]Right away![/I]" Saisei acknowledged.  Shiranui mega evolved the Mewtwo to its Mega Y form and he advised the trio of Pokémon to avoid using fire and water attacks.  "Gallade, you get Groudon; Saisei, Pikachu, you get Kyogre," Shiranui directed, "Give them everything you've got!"

The trio consisting of a Pikachu, Mega Gallade and Mega Mewtwo Y proceeded to keep two of the Weather Trio from doing more damage.  Shiranui was worried as he had never taken on two insanely powerful legendaries before.