I am not sure, but you may find it as an item in Solar Cave. Go there after beating Rayquaza and try find it.
you get HM surf
solar cave
I believe it is in Solar Cave...
Any water pokemon. Goldeen, Barboach (etc.)
You beat Entei in Fiery Field. NOTE: You'll need Surf.
western cave on floors 3 thru 6..you must the hm SURF to enter..VERONICA
In Pokemon Mystery blue Dungeon, after you beat Rayquaza, you should be able to go to a dungeon called solar cave. There you will find the HMS surf, dive, and waterfall. In sublevels 10-20 you should find a few Chimechos. I have one Chimecho
http://upokecenter.com/games/dungeon2/guides/wondermail.php
I have a Lapras with surf.
1. get a water type Pokemon 2. go to solar cave 20th floor is where surf is
From what I have heard, you go to solar cave and on the 20th floor, you might need a key and and a trawl orb or flying pokemon to go over water. Can you reply to this if it works, I think it does, but i am not sure
Mt Faraway is located towards the top left corner of the world map in Pokemon Mystery Dungeon Blue and Red Rescue Team. To access this dungeon, you must have cleared the Fiery, Lightning and Northwind Fields and have in your possession the Rainbow Wing. After you defeat Suicune in the Northwind Field, Mt Faraway will be unlocked and you may travel there with your team (as long as one Pokemon knows Surf or you have the HM in your items bag).