Potions heal Pokémon, restoring HP lost during battle. Potions come in various strengths are restore different amounts of HP. However, if a Pokémon loses all its HP, it will faint and can’t be healed with Potions. Revives are used to revive Pokémon that have fainted. Max Revives fully restore a fainted Pokémon’s HP, while standard Revives only bring back a portion of total HP.To heal or revive a Pokémon:

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Pokémon GO Game GUIDE