Bootleg
These may have pets to raise, or they may advertise that they are, but have some kind of entirely different gameplay. All of these items use licensed characters without permission, making them unofficial merchandise.
32 in 1 Hello Kitty
32 in 1 Hello Kitty
This appears to use an early version of the Bunny Rom, similar to the Virtual PETs.
Uses the Hello Kitty Metcha Esute packaging.
D-Digiking
D-Digiking
The packaging for the Patamon is almost believable, but it seems to be a basic multipet using Digimon sprites.
Hamtaro Pet
Hamtaro Pet
It's not even a pet - it's a D-3 shaped like a hamster!
It seems to be based off the Japanese version of the D-3 Digivice.
Pokemon Electronic Pet
Pokemon Electronic Pet
Just another early Bunny Rom, this time shaped like a Pikachu.
My Sweet Cat
My Sweet Cat
Looks like the Metcha Esute, but... is a Dinosaur, according to Tamenagerie!