His most famous PokÃ mon , and probably the most famous PokÃ mon , is Pikachu . The term `` PokÃ mon '' , in addition to referring to the PokÃ mon franchise itself , also collectively refers to the 646 fictional species that have made appearances in PokÃ mon media as of the release of the PokÃ mon role-playing game ( RPG ) for the Nintendo DS , PokÃ mon Black and White . Like the words deer and sheep , the word `` PokÃ mon '' is identical in both the singular and plural , as is each individual species name ; in short , it is grammatically correct to say both `` one PokÃ mon '' and `` many PokÃ mon '' as well as `` one Pikachu '' and `` many Pikachu '' .