On a V4 it seems like you get Debatchi from either Obotchi or Hawainotchi teens - it's a male character - so if you have a girl on your V4 right now, you'll have to wait and try for one with a boy
I don't think you need absolutely perfect care tho' - probably average care might do it.
The Debatchi doesn't seem to belong to any specific skills group - so I don't think you need to try for Intelligence points in favor of Kindness points for example.
Sorry I can't be more helpful.
Here's a link to spudi's growth chart - I find this very useful - and everything my V4 has done so far has been accurate on her chart: