This cheat should be entered into the console when in the main menu. It will allow you to choose any creature from the Sporepedia when you start a new creature game. Evolutionary advantaged creatures that are usually locked when starting a game will be unlocked.
The syntax for the evoadvantage command is as follows:
evoadvantage Joker Badge
Find below working examples of the evoadvantage command.
This is the only way to use the evoadvantage console command - after using this cheat, you will be able to select any creature from the Sporepedia.