Where is altering cave in Pokemon Pokemon LeafGreen?

Answer 1

Its on six island just surf on the right side and battle the rocket and beat him and he will ask you have you seen a rare Pokemon any where something like that then go inside go to the right up the stairs and STAY ALONG THE SIDES and the groude will shake and a weird noice will sound and the screen will flash and and mewthree will apear or mew will ethier one will i did it and i got mewthree ok ill tell you the secret if you have fire red mew will appear if you have leaf green mewthree will appear. P.S my name is Alison

hay its alison im going to guide you ok first go to the right sid and surf up the you will land on a island called water path go up the turn left by green path the go into pattern bush do in then go up a lttle bite use reple in less you want to see the Pokemon that are feally weak turn left and keep going strait then go down to a dirt path you will exit pattern bush go down the turn leftdown on the little platform then surf up when your near and platform with a girl on it get on it walk up and surf up keep going up intill you reach to swimmers next to each other go around them and surf uppast anther swimmer then do left up then land on that isand and theres artertia cave!!!

Answer 2

Altering Cave is found to the north of Fortune Island, on Outcast Island.