Battle · Bruno (Elite Four)
Elite Four: Bruno
Onix L53, Hitmonchan L55, Hitmonlee L55, Onix L56, Machamp L58.
medium
Round two, and the easiest of the five if you brought a Psychic.
Step 1: Lead a Psychic
Psychic is 2x on all three Fighting-types, and none of them can answer it - Kadabra, Alakazam or Starmie can solo this round outright.
Step 2: One-shot both Onix
Onix is Rock/Ground: 4x from Water and 4x from Grass, with only 35 base HP behind 160 base Defense. Surf ends it instantly.
Step 3: Watch Machamp
L58 with 130 base Attack. Take it out with Psychic before it lands a Submission.
Step 4: Save your items
You need them for Agatha and Lance.