-Flamethrower
Typically you won't use it in second job, and then start using it in early/mid 3rd job when you're training on flat maps with mobs that you can't 100% hit yet. I haven't used it since lv95, myself.
-Atomic Hammer
Never becomes obsolete. Its ignore defense makes it stronger than Punch Launcher, and overall IMO is just the better skill between the two. It has a shorter range in front of your char, but that doesn't really matter because you're almost always right in front of mobs. Even if you're not it's got a great range in front of you anyways. Not to mention an awesome vertical range, and can hit mobs behind you.
-Punch Launcher
I never really used it myself. I attempted to try and use it while training, and seemed to awkward of a skill to use compared to Atomic. I haven't had it hotkeyed for a good 30 levels or so.
-Rock N' Shock
I can't say this becomes any sort of obsolete, but it's not really a skill that you will use a lot, either. Some say it helps out training, but the only time I found it any sort of useful in training was at Kru/Captain maps, but even then it didn't increase the EXP rate for me over other training spots at the time. It can be helpful at some bosses, I still use it at Pap to keep it cornered.
Tank only replaces prototype somewhat. There are maps where prototype is better to train on (bigger maps that require drilling), and there are maps that tank w/ laser is better (smaller maps where you can just jump down and spam laser).
As far as 4th job SP goes, I did 1 Tank/Laser/Giant Robot at 120, then went on to max Extreme Mech. I also added 1 point into Satellite Safety/Robot Mastery at lv121, but Safety is basically useless and Robot Mastery isn't needed at all. Giant Robot is an okay skill, I used it a bit while training at DGP, but haven't used it again since then.
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