Yeah, a random PID is perfectly fine, it just shouldn't really be related to any algorithm.
Say if it's related to method 1...
1/32^6 = 1/(IV combos)
=1/1,073,741,824 chance to get the method 1 combo (as you already have a PID in mind)
That's your chance of getting a method 1 PIDIV. Granted there are a couple IV sets for a PID for method 1 on average (say 4... 16^8/(32^6)=4). SCV's IVPID.exe is a good illustration of this.
That makes it around a minimum of 1/268,435,456th of a chance to get a Method 1 PID on an egg.. Those odds are fishy!