1. When your tamagotchi is sick, do not cure it, untill a while.
2. When it beeps ignore it.
3. Make sure it is on a even generation.
4. Take HORRIBLE care of it.
5. Barely feed it.
6. Barely exercise it (games)
7. IGNORE IT
8. Make sure it is very unhappy.
9. Let it's poop stack up to about 4 piles.
10. Make sure it has low GUTS points, and training.
11. Barely take care or watch it.
12. Make sure your tamagotchi is very high in weight
Becareful doing this method can kill your tamagotchi.. You may get a different character.