I don't remember if the PC is accessible. You can try loading an older version of the backup save file before you entered Devon Corp if it's available. Or, you could trade using online play and get a suitable high level Pokemon that can help with this battle.
Member of the Year- @Candy
Artist of the Year - @Arkiel
The Shelly Citra Award - @BandorKitty
Most Likely to Become Auth - @Sayia
Most Likely to Become a Gym Leader - @not Azery
Most Likely to Start a Religious Cult - @DerogatoryTrainer
Most Likely to Have a Philosophical Debate With Themselves - @Commander