In Pokemon Emerald, once you capture all of the Pokemon in the Hoenn region,
Professor Birch gives you the option to take home either Cyndaquil, Totodile, or Chikorita.
I believe that this should be the same in PokeMMO since it runs on the Emerald ROM.
(excluding the capture of unobtainable legendaries of coarse)
http://bulbapedia.bulbagarden.net/wiki/List_of_in-game_event_Pok%C3%A9mon_in_Generation_III#Johto_Starters