Oh yeah good idea posting links to an Imgur album instead of embedding images. I just realized there's a limit to how many images you can add to a forum post.
Btw you can tap on the (-) magnifying Scope icon at the bottom left to make the moves smaller so it will show more per image instead of having a lot of images.
Well, I could do that as well. I tried uploading it on this site the first time, but for some reason it wouldn't let me, so instead I went with imgur. I hope that's not too big of a problem.
Looks like these moves are quite rare, especially gold variants: Deadly Airport BB3, Forbidden Procedure BB2, Countervenom: Paralysis BB1, Countervenom: Detox BB2, Lonesome Lenny BB2, Egret Dive SM, Excellebella BB2, Pummel Horse SM.
Just a second, but what does the 2 and 3 behind BB mean? The equip cost or something else? At first I thought it meant the cost of the blockbuster, but apparently that's not it, so eh. Anyway, on to which ones drop more often and which ones drop less.
Deadly Airport BB3: Yeah, for sure. I think I only ever got 1 Bronze and 1 Silver and that's about it. I got both from farming Peacock's daily event, so I'm assuming that it SHOULD be possible to get a gold one as well, it's just really rare.
Forbidden Procedure BB2: Same as Deadly Airport, except I only ever got one silver. This one is probably one of the more rare moves that I got.
The Countervenoms I have to disagree with. I have gotten several of all three of them. Or maybe I was just lucky, but I don't think those are all that difficult to get.
Lonesome Lenny BB2: Yep, also very difficult to get, but from my experience less difficult than Forbidden Procedure.
Egret Dive SM: Never got that one, so I agree.
Excellebella BB2: Wait... Really? I didn't think this one was that hard to get. Once again, I did farm a lot, so maybe I'm wrong, but I don't think any of Cerebella's moves were hard to get.
Pummel Horse SM: I have no idea what that is. Do you have a picture?
Anyway, per character these are the moves with the lowest chance of dropping::
Peacock: Deadly Airport, Lonesome Lenny, Boxcar George (I do have 1 golden, but I only ever got 1).
Cerebella: Honestly nothing. I think all of her moves are very easy to obtain. Or maybe I was just lucky.
Painwheel: Gae Bolga Stinger (But I may have just been unlucky with this one), her 7 cost BB and maybe her 8 cost BB (I only ever got 1).
Filia: Trichobezoar (cost 6) and that's really it.
Big Band: Really only his 5 cost BB. Everything else was fairly easy to get.
Parasoul: She's kind of tough to evaluate for me, because I feel like I've been very unlucky with getting her moves in general. Silent Scope and Napalm Shower didn't drop all that often (especially the gold versions), but I never even got her 7 cost BB, so like I said, I'm probably just really unlucky with her. Canopy Bounce for some reason drops like crazy for her.
Valentine: Really only Forbidden Procedure. Which sucks, because I think it could be a really strong one.
What I've noticed is that the 7 and 8 cost BB's have a fairly okay drop rate for all the characters (except Painwheel and Parasoul for me personally). So no one should be all too worried about not being able to get gold versions of those.
What effects do these moves have? I never got them in any tier so I don't know: Deadly Airport, Forbidden Procedure, Lonesome Lenny.
Here you go:
http://imgur.com/a/k1VAR
Out of those 3, I'd say Forbidden Procedure is the best. I think. I haven't used it yet, but that's mostly because I don't have the gold version of it yet.