Shiranui went into Brooklet Hill and soon after he reached the bottom, a large Wishiwashi in its School Form appeared.  He sent Ashika out and the Trial was on.  "Start with Double Team!"  Ashika put her acrobatic skills to work and lots of Brionne appeared.  Wishiwashi used Rain Dance to change the weather to heavy rain.  The totem called out and an Alomomola showed up to help out.  "Ashika, sing them a Perish Song!"  Alomomola charged in and gave Ashika a Double Slap, hitting a copy and causing it to vanish.  Ashika sung a haunting diminished fifth chord that set the clock ticking for all Pokémon currently involved.  Wishiwashi used Feint Attack and struck the real Ashika for major damage.  "Ashika, use Protect!"  The Brionne conjured a green shield just in time to repel a two-pronged Water Gun.  "Ashika, make like a [i]kunoichi[/i] and use Substitute!"  Alomomola used Helping Hand to power up its comrade and Ashika dove underwater, leaving behind a lookalike to take a few hits.  Wishiwashi sprayed a Brine and the attack did enough damage to break Ashika's Substitute.  The Perish Song count was at 1 and Shiranui enacted the final part of his strategy.  "Ashika, return; Ikari, I choose you!"  Shiranui switched out his Brionne and sent out his shiny Bagon.  Ikari was inundated with a two-pronged Water Gun and Wishiwashi and Alomomola were both stricken by a crimson glow as the Perish Song sapped away their energy and caused a double knockout.

A Solo Form Wishiwashi that wasn't involved in the Trial swam up to Shiranui and gave him the Waterium Z.  In return, Shiranui gave the Wishiwashi a couple of Sitrus Berries with the instruction to deliver them to the totem and its Alomomola companion.