Simplify the following text for a Grade 4 native English-speaking person.
Original: All PokÃ mon have hit points ( HP ) ; when a PokÃ mon 's HP is reduced to zero , it faints and can not battle unless revived with a PokÃ mon skill or item .
Simplified: All PokÃ mon have hit points ( HP ) . If a PokÃ mon 's HP is down to zero , it faints and can not battle until the player revives it .