P2 Lab & Colress

By now, you should have meet your old BW MC's mother.. Keep in mind she will also heal your Poke.. And she's so much hotter than the current one.. *sigh*  Joke aside, you will need Strength and Surf (pretty obvious I bet) here.. Now let's head to Route 17..

Start by surfing the water on the left! Then you will land on "somewhere".. There will be trainer here of course, battle or flee is up to you.. Cause it will be troublesome to have low HP here.. Head to the south-west from where you landed.. Then you will be at Route 17.. All you can see is water here.. Surf to the left side.. There will be a place where you have to choose one of the three high-water-currents.. The first one will lead you back to where you are from.. Go to either the 2nd and 3rd one.. If you used the 2nd one, you will need to manually switch to the 3rd one.. The 3rd current will eventually leads you to Route 18.

Basic rule, always find a healer/PokeCenter before raping any trainers.. Go to the top from where you landed.. There will be a house, the girl there will be your healer for the time being.. Now feel free to explore the WHOLE area.. At another cliff, you will se Crasher Wake.. You can't battle him, basically he's more of less cameo.. You should also notice that (without surf) there's one area at the bottom that you can't reach.. Ignore that area.. After you have seen him, head to the right side..  You will get Magma Stone there.. Then go down the stair and surf to further east..

Now you should reach P2 Lab.. You will see Team Plasma's ship.. Enter the ship.. There won't be any battle-able trainers except Colress.. If your pokes aren't in good condition, go to the grunts' rooms.. The second room on the right will be able to heal you if you click on the bed there.. Once you are ready, go to the room where you met/fought with Colress in the ship last time.. But let me warn you, it's not going to be easy.. His main type is steel with about lvl 72.. He has Psychic pokes and Life Orb-ed Water Rotom to cover his weakness, so watch out.. He will start with Magneton (Study + Thunder Wave), so your first Poke will most likely to be Paralysis.. Of course, it would be nice if you have a Ground Poke here.. You will "surprisingly" get another Masterball from him if you won the fight..

After the battle is done, you might want to heal your Pokes again in the place I mentioned just now.. Now go back to the sea.. Now let's go to the part where you couldn't reach at first.. In order to reach that side, you will have to 100% avoid any current.. And it's a one way road.. It's on the left side, you have to open your eyes wide to find it..

I can tell you that for the first time you going through the "road", you will probably have to battle with a girl.. After the battle, this girl will block your road.. You have no choice but to go back to P2's land and enter the room then exit to reset her position.. Go back to the sea, and follow the same road again.. You will eventually land on the area you have yet explore.. After this, you are done with here..