Ashling, the Limitless

If the copied permanent had {X} in its mana cost, X is 0.

If Ashling leaves the battlefield after you've cast an Elemental permanent spell and paid its evoke cost but before that spell resolves, the permanent that spell becomes will still have evoke when it enters. As such, the triggered ability represented by evoke will still trigger, and when that abiltiy resolves, you'll still have to sacrifice that permanent.

The token created by Ashling's last ability copies exactly what was printed on the original permanent and nothing else (unless that creature was copying something else; see below). It doesn't copy whether that permanent was tapped or untapped, whether it had any counters on it or Auras and Equipment attached to it, or any non-copy effects that changed its power, toughness, types, color, and so on.