Shedinja is a special Pokemon that has a unique special ability: wonder guard.
Effects of wonder guard: Makes all move that are not super effective not hurt Shedinja.
Shedinja's type: Bug and Ghost
Types of moves that will hurt (or kill, since Shedinja is only 1 hp): Fire, Flying, Rock, Dark etc.
Do note that moves that does not inflict damage directly will also work on Shedinja. Examples include toxic (Shedinja will die the next turn due to poison), will-o-wisp (similar reason), or confuse ray (if it hurts itself, it will get hurt like others)
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Shedinja does not evolve any further than its current stage.
Shedinja learns false swipe at lvl 25.
No.
Since Shedinja has 1 HP, a Sandstorm or a Hailstorm will KO Shedinja within 1 turn. In other words, if you encounter a Shedinja, your Tyranitar or Abomasnow don't even have to do anything. Otherwise, you can simply use 1 offensive fire, flying, rock, ghost, or dark move.
Nincada evolves into ninjask at level 20, but you have to leave an open space in your party because after Nincada evolves, a Shedinja appears. My Shedinja appeared at level 27 with a max HP of 1. But this isn't a problem because Shedinja's "wonder guard" prevents any critical attacks.