You need to defeat the gym leaders,elite four, and champion of a specific league(Kanto, Sinnoh, etc.) to be able to catch a specific legendary. You can go see the pokedex on the site to know on which map that specific legendary can be caught.
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you can find mew,articuno,mewtwo,moltres and zapdos hope i helped my user on pokemon deluge is pokemonzoroak trade me if you want
the legendaries can be found when you defeated all gyms
we find dialga in map 3 in Pokemon deluge...
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you find them underground