Also is there a requirement to catch mew ?
I am not able to climb the stairs leading to it. Something invisible blocks the way
Just try the newest version 2.03,I think you can pass the stairs now,but the bug about Escape Rope...I still haven't fix it.
Go to Waterwave Path to battle Luke and Eva near the Stardust Fountain,they'll give you HM06,you can use it to break the rugged rock which blocks another passage in Mt.Skywall.
You can get a key after you find and defeat a member of Dark Workers for four times,you can find him the first time in Redwood City.