Simplify the following text for a Grade 9 native English-speaking person.
Original: One of the consistent aspects of the PokÃ mon gamesâ '' spanning from PokÃ mon Red and Blue on the Nintendo Game Boy to the Nintendo DS games PokÃ mon Black and Whiteâ '' is the choice of one of three different PokÃ mon at the start of the player 's adventures ; these three are often labeled `` starter PokÃ mon '' .
Simplified: A number of PokÃ mon video games have been released , all on Nintendo game systems , as the PokÃ mon Company is owned by Nintendo .