Haha, probably not. I only know of two people who got shiny flawless spread off of a random ID/SID combo, and one of them had alooot of save files, XD. It's pretty hard if you're not abusing.
In any case, if you are abusing for it, know that they usually come in pairs (but if you're MattJ and is awesome...they come in like 8s, haha). What that means is that an ID/SID combo usually produces two natures of the same flawless spread if you abused for it ^^
And haha, Heatran is diverse...Taunt one is nice though. It can switch into alooot of things and at the very least destroy with three attacks, haha. Shame it's a bit slow, haha.
Jolly/Adamant? I've never seen one of those, haha. Does it have alot of physical moves in its arsenal? :o