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What hurts a poltergeist, assuming you've found a way to target it? Does arcane strike hit and do damage, since they are incorporeal? If yes, then does adamantine, since it is considered a "magic" weapon? Or are they immune to ALL physical attacks, regardless? Would fire hurt them? A grenade, or arcanist bomb? They regenerate, too, right? Ugh... Thanks
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These days magic weapons deal half damage to incorporeal targets. Weapons with Arcane Strike are considered magic so they would deal half damage. Adamantine is NOT inherently magical, so it would have to be enchanted (+1 or better) in some way to harm a poltergeist. Force spell (like Magic Missile) deal full damage to incorporeal targets, of course you still need to knew where to aim, which can be tricky since poltergeist are naturally invisible.
If a poltergeist is dumb/arrogant enough to use its Frightener ability, then it regains invisibility the END of its turn, means it cannot move after using Frightener, so you will at least know were the aim, although your attacks will have a 50% miss change since you cannot see it.
I used a poltergeist against my players once and quickly regretted it. 2nd level players cannot reasonably combat something with natural invisibility, incorporealness, telekinesis at will (3d6 damage), flight, and undead immunities. Even if you do guess where it is and use Glitter Dust, it can retreat into the floor or solid wall until the Glitter Dust were off, then return and resume using telekinesis.