In order to survive on almost any other planet in the galaxy aside from their homeworld, the Skakoans require special pressure suits. This means you don't see many Skakoans in the rest of the galaxy.
Skakoans were introduced in version 1.0 of the game, and they can appear on their own, but all the other races and characters must be unlocked first (with the exception of Salvage Droids characters).
The cost for the Skakoan starts at 1089 Bux, reduced by one Bux for each level you own. If you have 134 levels (the post-shutdown maximum, barring Salvage Droid levels) the cost is 955 Bux.
Skakoans do not unlock any scenes.