Simplify the following text for a Grade 5 native English-speaking person.
Original: Originally a single series , PokÃ mon , it has since been made into four series , including Advanced Generation , subsequently Diamond and Pearl and Best Wishes , which sequentially continue the story of PokÃ mon , while its spin-off PokÃ mon Smash ( formerly Weekly PokÃ mon Broadcasting Station and PokÃ mon Sunday ) has broadcast a series of stories revolving around some of the recurring characters , PokÃ mon Chronicles or , as it is known in Japan , PokÃ mon Side Story .
Simplified: His most famous PokÃ mon , and probably the most famous PokÃ mon , is Pikachu .