Assume villian raise/call my 3 bet with JJ-88,AQo-AKo and 4 bet his AA-QQ,
which hands below you prefer more to 3 bet villian with?

(A) Axs,Kxs for blocker effect but can easily dominated
(B) JTs,T8s flop well and easier to play postflop
(C) AJo-A9o,KQs-KTs to merge range

Is small pocket pair a good hand to 3 bet bluff with? Any advice is appreciated. Thanks.

Obv (A), this range blocks his one better than the others and you have better bluff catchers than T9s i.e. Also KTs (or same) is a good hand to 3b bluff with if his range is not very wide and you expect him to fold often. If you are IP I'd rather call btw (in CO vs BTN dynamics if CO opens wide i.e.). I never 3b AJ vs regs because I can get more value if I flat and play poker, anyway this hand is a MUST 3b vs fish since you can valuetown them. Same applies to KQ and sometimes KJ; you can still 3b these as bluff vs tight players in situations you can't flat profitably (some UTG vs CO or something). A9o is the biggest crap since you have no SDs and FDs when called.

The first question is: "Should I have a 3bet bluff range?"

If the answer is yes, then bluff with the hands that play best against your opponent's calling range.

you can probably 3bet ATC vs that guy since he folds so much (assuming normal pfr%). There is not much value in having a depolarized 3bet range against him so you should just 3bet air and value hands. Not hard to figure out which part of your air range plays better vs his calling range

The non-folding range you've specified is not even 6%, so unless he's supernitty wrt his PFR, you should be 3betting him pretty relentlessly, mostly with bluffs.

blockers when you expect him to either 4bet or fold
playability when you expect him to call a decent amount