Attach Focus Band to 1 of your Pokémon that doesn't have a Pokémon Tool attached to it.
If the Pokémon Focus Band is attached to would be Knocked Out by your opponent's attack, flip a coin. If heads, that Pokémon is not Knocked Out and its remaining HP become 10 instead. Then, discard Focus Band.

Focus Band
Neo Genesis 86 · Trainer · Pokémon Tool
StandardNot legal
Regulation marknone
RarityRare
Standard uses regulation marks H and later, plus identical reprints of legal cards.
Released December 16, 2000.
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Build with this card
The Pokémon deck builder checks every deck against the Standard rules, and Genny can build one around Focus Band.
Open the deck builder