There GBC and SNES about Tamagotchis, and also some simulators. You can find a good one and more Hadheld/Game & Watch Stuff
here
And for the console games, I know these:
SNES:
Tamagotch Town
GB, SGB functions:
Tamagotchi (JUE)
Tamagotchi 2 (J)
Tamagotchi 3 (J)