Coagu

I've had a look through the topic but I couldn't find an answer to what I'm about to ask, I do apologise if it's a trivial question. If I want to create a pokemon that appears to be transferred from Gen IV to Gen V... Do I use the OT details from the Gen IV game? Secondly, if I want to make that pokemon appear to have been hatched in Gen IV and then transferred over, is it best to mark the pokemon as hatched? If I do that, would it let me leave the PID field blank and carry on as normal?