Um well i don't think theres a 100% sure way to get a Gozuratchi on the v3 but i think it comes from bad care. Like waiting untill it has like 1 or 2 hearts left before filling them up.
It may not work, and you might get a Tarakotchi instead..
For what I know you can not get a Gozarutchi for sure on a V3. You just have to take regular/bad care. Don not fill al hungry and happyhearts all the time, let him weight a lot. Don't play a lot of games, do not give him his favorite food and give him timeouts when he needs it.
Do not take such bad care that your Tam may die!! Just take 'not so good' care and hope for a Gozarutchi.