>>12284987Think Diamond/Peral/Platinum. Time and Darkness are like Diamond and Peral, just different pokemon available. Sky however is like Platinum, except all the pokemon in gens 1-4 are available and it has additional content, such as more items, spinda's bar and the special episodes I mentioned earlier which tells a small story from another character's perspective from the many characters you encounter during the main story. There are 5 in total and take about 5 hours to complete in total.
TLDR, there's no reason to get Time or Darkness when Sky is available
