If the copied token is copying something else (for example, if the copied token is one previously created by this ability), then the token enters the battlefield as whatever that token copied.

The token you create copies the original characteristics of the token as stated by the effect that created that token, (unless that token is copying something else; see below). It doesn't copy whether that token is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on.

If the copied token has in its mana cost, X is considered to be 0.

Any enters-the-battlefield abilities of the copied token will trigger when the token enters the battlefield. Any "as [this permanent] enters the battlefield" or "[this permanent] enters the battlefield with" abilities of the chosen token will also work.