By reducing their HP to 0, you can Knock Out the opponents Pokmon

Reprinted from Vol.1 "Beast Fangs", "Book of Secret Arts", "Legendary Sword", "Power of Kaishin", "Violet Crystal" EX Starter Box and EX-R Starter Box "Ryu-Kishin" Booster R1 "Battle Warrior", "Blue Medicine", "Doron", "Fire Eye", "Hurricail", "Nightmare Scorpion", "Raimei", "Ryu-Kishin", "Synchar", "The Shadow Who Controls the Dark", "Twin Long Rods #1", "Vishwar Randi", "Water Element", "Wattkid", "Wicked Dragon with the Ersatz Head", "Yamatano Dragon Scroll" Booster Chronicle "Blue Medicine", "Raimei", "Wattkid" Other "Happy Lover", "Wings of Wicked Flame" Never reprinted in Japanese "Ancient Jar", "Dark Plant", "Dig Beak", "Djinn the Watcher of the Wind", "Droll Bird", "Embryonic Beast", "Gate Deeg", "Graveyard and the Hand of Invitation", "Lucky Trinket", "Man-Eating Plant", "Mech Mole Zombie", "Midnight Fiend", "Mystical Capture Chain", "Phantom Dewan", "Phantom Ghost", "The Melting Red Shadow", "Weather Control" Printed in the TCG seven monsters ("Battle Warrior", "Dig Beak", "Droll Bird", "Happy Lover", "Ryu-Kishin", "Wattkid", "Wings of Wicked Flame"), both Normal Spell Cards ("Blue Medicine" and "Raimei"), all five Equip Spell Cards ("Beast Fangs", "Book of Secret Arts", "Legendary Sword", "Power of Kaishin", "Violet Crystal")

These are the official recommended rules by WotC, but its a casual format, so feel free to experiment with other card counts
The archenemy has 40 life and always plays first
Some of them are great
Every card in this slot is brand new as of the holiday release, and this slot is the only place to find these treatments