yes but you must get them on the pokedex first.(see them in the wild) then press start and if they are in the same route go into the grass to catch it.
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It appears randomlly in the grass in Johto you have to get lucky and spot it then use you pokedex to track it and catch it.
you get it at the battle park for 32 b.p its easy to catch enti, rioku, and latios with it
it all depens on the starter charmander=suicun bulbasuar=enti squirtal=rikou
what i did is i put in Pokemon fire red or you can put in leaf green. then, i went to the grassy place before entering solaceon town. but im sure you can go to iron island too.
You can find Lugia, the legendary dogs/ Suicune, Enti, and Raichu, and I think Ho-Ho