You play Moemon just like you do any Pokemon game... But if that's not what you're looking for... You would have to download the Moemon Hack for either FireRed or Emerald and a GBA Emulator.
Yes u can..look for the tutorials on Youtube.
Akira Sakamoto has: Played Moemon in "Ninjo todokemasu Edo" in 2003. Played Daigo Iwamatsu in "Limit of Love: Umizaru" in 2006. Performed in "Tsurukame josanin - minami no kuni kara" in 2012. Performed in "Tabakoi - tabako de hajimaru koi monogatari" in 2012. Played Toneyama in "Poison" in 2012.
The cast of Ninjo todokemasu Edo - 2003 includes: Mieko Harada as Afusa Haruko Mabuchi as Oshige Yoneko Matsukane as Okane Goro Noguchi as Yabui Yukiyoshi Ozawa as Seitaro Akira Sakamoto as Moemon Masane Tsukayama as Kasuke Sayaka Yamaguchi as Okumi Shingo Yanagisawa as Gorohachi