They are in fact all based on RNG! Therefore, you can in fact get a gold SM with those parameters! However... Most of us are uh... "lacking" the luck there but it's totally possible! If I recall correctly as well, there may be an update that will let you check the substats of the moves after you obtain them! But otherwise, yeah, its all random so you may get lucky and get those 3 stats you want! Or... Like me, and get mainly moves with "Stun Resist" or "Block Proficiency"
: V