Go to four island and go inside icefall cave and find HM7 waterfall then teach it to a Pokemon that can learn it then go up the waterfall in icefall cave and beat the rockets that are attacking lorelei. Go back to six island after this and head to dotted hole with a Pokemon that knows cut and use cut on the door to open it. Fall down the hole inside then go up then left then right then down.
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You go to icefall cave and defeat team rocket there.
Answer:Have a Pokemon use the HM move Cut on the door.
the guy standing in front of the dotted hole is there, because of a later cause. but, to move him, you have to give the ruby to bills friend, i think. then, go back, and he should be gone., then use the hm move cut on the door. your probly thinking, who uses cut on a metal door, right?
you need to get palkia from pear version and show him to the guy, and the game will glitch and you'll be in burger king yo.
I believe that after you give the ruby to Celio on 1 island, you can now visit dotted hole, use cut on the metal door (select a Pokemon in your party that knows it). If you go before returning the ruby, a scientist blocks the way. After that, you can access and move down a series of holes that lead you to the emerald. The scientist mentioned earlier will steal it, claiming it is his and he tells you the second password for the rocket warehouse. The dots on multiple walls everywhere are actually brail, a brail packet was included in the original fire red/leaf green box but you can just guess and check like I did. :) hope this helped