Also, on DS formats, it is less geared towards experienced play than Showdown!: the person who you fight may have no experience at all, and may be less predictable due to having 'weird' competitive sets and not switching as much, whereas in Showdown!, you always have ladder matches where you are (generally) pitted against a player of a similar skill level, as well as people being more competitively aware and having perfect sets on Showdown!. :P