How do NPCs heal our Pokémon?

How do NPCs heal our Pokémon? - Unrecognizable female sitting with bare legs on white sheet with small red heart in hands in light room in daytime

In various Pokémon games, there are scenarios where we come out of a big fight (usually a boss fight) and an NPC heals our Pokémon for us. I know that Pokémon are healed in Pokémon Centers using special machinery, but is there any in-universe explanation to how these NPC can heal them at a seconds notice without any help?

The player's Pokémon being healed by a nurse in FireRed/LeafGreen






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How do NPCs heal our Pokémon? - Book Page
How do NPCs heal our Pokémon? - Unrecognizable female with manicured hands holding white flower in hands in soapy water during spa procedures
How do NPCs heal our Pokémon? - Pile of sparkling drug capsules scattered on pink surface






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Images: Puwadon Sang-ngern, Thought Catalog, Monstera, Alena Shekhovtcova