This is the order of people who would make a list of their favorite Pokemons.
Using the OP's site - Retards that want to use something that is somehow worst then a simple bracket system.
Single Bracket - Lazy people that don't care for accuracy.
Double Bracket or Triple Bracket - People with common sense that want to give their favorites a chance against their other favorites.
Swiss or a Round Robin with a knockout rule - People with a lot of time on their hands but will have the most accurate results ever possible. You may have to check to see if you have autism afterwards though.
http://challonge.com/This site will allow Single, Double and Swiss tournaments though if doing Swiss you will have to do a generation at a time. No matter which you pick I can guarantee it will beat the useless site in terms of accurate results.