Hi, im not sure but apparently you cannot get the tiger hamster in the shop, i breed mine
but i dont know how i did it, i think i was just breeding my partners and i got it without
trying :p it was good luck :) just keep trying and you might get it

As for this firefly hamster i dont know what your talking about, i heard about it in one
of the cheats but apparently its not real.

You need a normal dwarf hamster and a white albino cambell hamster. Breed them like you
normally would. When the female gives birth, keep rebooting the ds until she gives birth
to a tiger hamster!