Simplify the following text for a Grade 7 native English-speaking person.
Original: PokÃ mon Gold Version and Silver Version are the second installments of the PokÃ mon series of role-playing video games developed by Game Freak and published by Nintendo for the Game Boy Color .
Simplified: PokÃ mon Gold and Silver are two role-playing games made by Game Freak and published by Nintendo for the Game Boy Color handheld . They are the second games in the PokÃ mon series , and increased the number of PokÃ mon to 251 .