I can't find the Team Aqua hideout supposedly located on route 127 in Emerald... I've read a bunch of walkthroughs, but still can't find it, so if anyone has a map, or screenshot or something?

Aqua's base is around the shore of Lilycove.
Magma's base is on Jagged pass.

To get to any place, you need to beat Aqua at mount Pyre. You will get the Magma emblem there.

To get to Aqua, go to the base and talk to the 2 guards. They'll tell you that their boss is in Slateport. Go to the place on the top right that touches the shore.Talk to the person who you gave the Devon goods to and you will get a scene where Aqua steals a submarine. Go and beat the Aqua base(and be sure to take the masterball) and once you beat Aqua there, go search the ocean and dive until you find for cave that leads to the submarine. Resurface there and beat Aqua in some cave and awaken Kyogre.

To get to Magma, go down or up Jagged pass until you hear rumbling. The Magma emblem will open a cave. Go in to find Magma's base. Defeat them there to awaken Groudon.

Then you go to Sootopolis to find Groudon and Kyogre fighting. Go talk to Steven and be led to the cave of origin. Speak to Wallace and answer his question with "Sky Pillar" and then go there. It is a bit east of Pacifidlog and on the top part of the screen. Surf around a small path to reach Sky pillar, go up it (you need the mach bike a bit) and awaken Rayquaza. You will be brought to Sootopolis and watch Rayquaza calm Groudon and Kyogre.

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and once you beat Aqua there, go search the ocean and dive until you find for cave that leads to the submarine. Resurface there and beat Aqua in some cave and awaken Kyogre.

It's at the Sootopolis entrance.

My advice is that you should dive in those large strips of dark water. I remember that the cave is in one of those places. If I remember correctly, it is a U-shaped diving area and there is a small piece of land in the middle. Dive at the bottom of the U

quote lindseth

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and once you beat Aqua there, go search the ocean and dive until you find for cave that leads to the submarine. Resurface there and beat Aqua in some cave and awaken Kyogre.

This is what I'm having a problem with. I can't find that cave.. Isn't it somewhere on route 127? I have already beaten Magma and Aqua at their bases.

I found the entrance now, after diving up and down in the deep coves below mossdeep to get a look. Thanks. I am so tired of Seagulls and Tentacools now.