Elite Four: Agatha

Round three. Every single Pokemon she owns is part Poison, which makes this a Psychic sweep on paper - and a status war in practice.

Step 1: Lead your Psychic again

Psychic is 2x on all five of her Pokemon.

Step 2: Enjoy the Gen 1 bug

Her Gengar and Haunter attack with Lick, and Ghost moves do nothing at all to Psychic-types in Generation I. Your Alakazam is literally immune to half her offence.

Step 3: Ground works as a backup

Earthquake and Dig hit Gengar, Haunter and Arbok.

Step 4: Bring Full Heals

She spams Hypnosis, Confuse Ray and Toxic. Toxic damage escalates every turn - cure it or switch out.