You have to look for the 2d black box then pause when you're at it. Press and hold select
until the pause screen changes and there will be only a "continue" button. Tap it and
there will be a level transition. You will be in the mirror room and there will be a star.
Touch it and the pose will be done. You will be stuck but to get out press a+b+l and
release,x+y+a,release,hold y and press l twice and you will teleport into the bowser
hallway with a waluigi painting. Jump in it and you'll transform into waluigi in castle
grounds. (fake! )

You must have 150 stars and play as luigi. Get the power flower on the roof then get your
self down and shoot your self in the peach painting on the castle.

Here's a fake way to get waluigi.
Step 1: get all 150 stars
Step 2: play as yoshi and go to the mirror room.
Step 3: go into snowmans land and choose silver stars mission.
Step 4: collect all silver stars with mario
Step 5: dont get the star get luigis cap instead
Step 6: kill the ice bully but don't get his star ether.
Step 7: go into the igloo with wario
Step 8: kill every enemey inside then walk out
Step 9: go into the freezing water as yoshi and stay there util 2 health left then exit
the course
Tbc………

I will start out fresh...
1. Get mario and go to dire dire docks
2. Get wario cap and smash the bricks
3. Push the switch star button and press start at the same time
4. Then you will see a waluigi cap where the switch star is, collect it.
5. Then exit the course
6. Play as luigi and go to big boos haunt
7. Kill big boo 3 times
(first the caresel, then the ghost hunt, last balcony)
8. Then collect the 8 red coins star
9. Get wario and go to the roof

1. Ground pound and you will have to go through a maze
2. After you finish the maze you will be in hazey maze cave but the original n64 version
3. Go to where you would get the metal cap (green box)
4. Where the switch was there will be a pipe
5. Go in the pipe and you will be in the negitive world
6. While in the negitive world go to where you unlocked wario and there will be a waluigi
painting
7 jump in it
You will have to fight the rabbit king
8. After you fight him you will notice a opening
9. Go in it and complete the obsical course then get the waluigi key.

This is 100% not real

On youtube i found how to unlock waluigi in super mario 64 ds

I was looking up ways to unlock him and someone said you had to lose all the characters
caps! Then you had to do all kinds of crazy stuff... I gave up trying to unlock him ages
ago...

1: get all 150 stars
2: beat the game 100 times
3: on the 101st time, you unlock waluigi

It'd be so funny if someone actually tried that.