Focus Sashin Pokémon Polished Crystal

Endures one OHKO move at full HP. (Hold) Focus Sash is basically insurance. If your Pokémon would normally be knocked out from full HP, it survives with 1 HP instead! It is basically like the Sturdy ability. That being said, the catch is it only works once and only when you're at full health, so entry hazards like Spikes will hurt. This item is a staple on lead Pokémon and fragile sweepers that need to guarantee at least one turn of setup. It's also really good on Pokémon with Endeavor or Counter since you can take a hit, survive, and punish them hard. Just keep in mind it's consumed after use, so no second chances.