I don't know but you can adopt or trade for one.
Treecko can be found in the map called "Mauville City Gym".
you can find him on almost every map
You cant find it you can only get it as a starter pokemon.
In Cinnabar Island.
You can find lugia on the league champion steven map.
Go to indigo leaders and go to Giovanni's gym (very last one on indigo leaders map) and there he is. He is very hard to find.
Moltres can be found in the Elite Four - Garcia map.
You can find Ho-Oh at League Champion- Steven map.
You cannot find giratina in any of the maps. You have to trade for it or hack for it.
whell horsea can be found in the misty map but itsrealy REALY rear and it can b found in Underwater map in INDIGO WORLD......but you can allways trade, but you need a groudon,palkia ho-oh,suicune or eny other cool pokemon.....ok you can find horsea at misty map and you can find him on the underwater map also.
Yes, you can find Groudon in the map called "Fuchsia City". It is catchable.
go to map somwhere in routes gyms or elite four