you need first go to the last beach. at the exit of the ruins, there will be a beach, with a place where you can build treehouse. then, you go to the beach when the tides out. then, go to the place where you just can only there when the tides out, and you will seems to trigger an event. from then, after the tides out on each beach, you can dive in the spot where you can go there on tides out only.
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lost in blue 3 is a DS games. lost in blue 1, lost in blue 2 , and 3!
There is not a second one there is only the first one. But in lost in blue 2 there is a second home.
You can get water stones by getting a blue shards.to get the blue shards, you have to get the HM Dive. have to beat the gym leaders in moss-deep to use Dive .You only can use Dive at places on the ocean that look like they have a deep areas.Dark-blue
Get the HM for Dive from the girl in Undella Town and teach it to a Pokemon in your teamSurf in Undella BayWhen you are over a dark blue spot (there are 4 of them), press "A" or select Dive from the Team ListYou will then dive to the Abyssal Ruins
in this rate of time, i haven't hear anything about releases lost in blue 4. There is a new lost in blue: shipwrecked in Wii. So, just pretend if that is Lost in Blue 4. hope I helped:)