I highly recommend intentionally dying to Cheren then pressing quit and play game so you can skip a textbox in the middle of the first fight

Press Play

-Cheren: Group Hug, Quick Attack x3

Keep Tepig name the same Ignore chest

-Professor Juniper: Swap to Tepig Shame, Ember x2

Keep Snivy name the same Ignore chest

-Ghetsis: Shame, Take down till Tepig is dead then switch to Pikachu, Quick Attack, Thundershock

Keep Oshawott name the same Ignore chest

-Ash: Swap to Oshawott Protein Shake-Up, Water Gun x2