This is correct, except when he is under 25. When he goes under 25 he definitely gets vulcanian impact and hellstorm. Attempted duo on him twice, first time was easy (with rdm/whm) second time even with my barfire set having improved I couldn't resist shit, and he was spamming firaga III. First attempt he was sticking to burn/flare/fire IV.
A note on clearing space to pull him to a safe spot...even with a rdm pumping haste into me and not needing to stop at all between the other bombs, I wasn't able to kill Big Bomb fast enough before PH's started popping. The tunnels didn't seem safe either, I wasn't able to find a spot that was safe from both the bombs and whatever mobs popped in the tunnel (besides right where you pop him, there's one that seemed to wander very very close but I don't recall it actually aggroing).
He hits like a mack truck even when in his smallest mode. If he sneaks in a quick hit after an unresisted firaga III you may be toast. If you make it to 25 percent on nin/dnc solo I would be very impressed, but due to him accessing vulcanian impact after 25 I think any progress after that point would be impossible between tp spam and firaga III (his vulcanian impacts hurt like hell). I used a mix of evasion and haste, full usu, velocious, rest was evasion, full timed yonin and used sushi. When blind landed his acc was pretty poor, but landing enfeebs wasn't all that easy.
When I went down the second attempt, however, my rdm/whm partner lasted a very long time kiting and sleeping adds, and took big bomb down an additional 40 percent before everything woke/unbinded at once on him. Pretty sure a rdm/nin could handle it solo. Note: we had a thief there each kill, but he didn't do anything but apply TH.
Added thought: My barfire set is by no means anything special. I don't waste my time camping kings so until I bothered with big bomb a barfire set wasn't even needed. If you have a very strong barfire set, maybe nin/dnc could do it.
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