I am using RNG reporter 9.92 beta, and trying to RNG a flawless Adamant Wonder Card Victini (the one with V-Create). I have not found the target seed and frame during December with the nature I wanted, but my DS's MAC address is 001AE90FD793. I haven't verified my seed yet because I have not tried yet, due to the fact that no results are being generated with the desired nature on them for this month.
What I want to know is if it's okay to change the month. Say, for example, I get the Wondercard from mystery gift, then save in a pokemon center in front of the delivery man. The desired result appeared in January 25 of 2012 (according to RNG Reporter), so I change the DS's clock to that date after saving in front of the delivery man, and RNG from there. Is it possible to get the desired result, or will it only work if the date is between 12-3-2011 and 12-31-2011 because of the time span of the wondercard giveaway?
Yes. Wondercard dates don't matter to RNGing.