Simplify the following text for a Grade 7 native English-speaking person.
Original: In second-generation games , breeding a shiny PokÃ mon with a regular PokÃ mon has a higher chance ( 1 in 64 ) of producing a shiny PokÃ mon. .
Simplified: They are extremely rare ; there is only a 1 in 8,192 chance of an encountered PokÃ mon being shiny .