Moaning Mrytle's bathroom does not have a password, you can just enter. Nobody tends to use it though because Mrytle makes them uncomfortable.
In Goblet of Fire, it was "Pine Fresh" as told to Harry by Cedric Diggory, and later used by Harry. However, it is assumed that the password changes often like the other passwords at Hogwarts.
In Harry Potter and the Chamber of Secrets the password was pure-blood.
rowling34
in chapter 24th
it seems to be, Nicepeoplearenice11
INCENDIO
The spell that Harry Potter used to cause Draco Malfoy to bleed continuously in the bathroom duel scene of "Harry Potter and the Half-Blood Prince" is called "sectumsempra".
azkaban
"Dissendium"
Harry Potter doesn't have a diary. In Harry Potter and the Chamber of Secrets he found the diary that belonged to Tom Riddle (a.k.a Lord Voldemort). He found it in Moaning Myrtle's bathroom where Ginny Weasley had thrown it away.
The bathroom door isn't available, it's just there to add more detail to the scenery of Lego Harry Potter.
Harry potter and the govlet of fire-4th movie- PG 13- 2nd task- the part where he puts the egg in the water in the girls bathroom where he hears singing