Shiranui helped Liam in his research while his Pokémon were being healed.  "According to what it says here, they specialise in Dark, Ghost, Ice and Dragon-types respectively," he stated, "From someone who's faced and defeated the Kalos Elite Four, I can tell you that your competition would be on par with my level of skill.  Having defeated me twice in a Pokémon League tournament, you'll have no problems succeeding."