Pokemon Yellow in 0:00
How to perform the glitch:
Step 1) Create a new save file. If you already have one, delete it.
Step 2) Choose your name as Ash and your rival's name as Blue.
Step 3) Go downstairs and walk on the tile above the right of the mat and below the left of the table.
Step 4) Save your game.
Step 5) Switch off/reset your Game Boy in the window of the [Yes/No] box disappearing and the text in the main textbox changing. Essentially, switch it off directly after selecting Yes.
Outcome 1: Your save is destroyed. Start from beginning.
Outcome 2: The save is not destroyed but you can't access the Pokemon menu. Start from beginning.
Outcome 3: The save is not destroyed but you can access the Pokemon menu. Go onward.
Step 6) Reload your save file.
Step 7) Access your Pokemon menu.
Step 8) Swap any Pokemon from slots 1-8 with the Pokemon in slot 10. (They will be blank, and slots 10/11 are off-screen. Use the noises to keep count)
Step 9) Swap Pokemon 11 with Pokemon 9.
Step 10) Exit the Pokemon menu and go to the Items menu.
Step 11) Scroll down until the cursor stops blinking. When it stops, hit the "A" button.
Step 12) The menu becomes glitched. Press Down, A, Down, A to access a glitched item menu.
Step 13) Scroll down until you find the first Master Ball in the list. Grab the item just below it with Select and scroll down until you find the second Master Ball. Then swap them.
Step 14) Toss out 68 of the item you just swapped (not the Master Ball).
Step 15) Exit the house and register in the Hall of Fame.
This glitch changes the exits so you skip straight to the hall of fame. How-to, done in 0:00, done on GBA.