This website was designed as a data-based approach to drafting in the Gen 3 Battle Factory. Each Pokemon matchup has been assigned a score from 0 to 1, with 1 being a perfect victory (100% outspeed and OHKO). The score includes not just winrate but also margin of victory, so it factors in things like damage taken, status conditions, boosts, and so on. These scores were assigned via a custom version of poke-engine's MCTS (https://github.com/pmariglia/poke-engine). Note that individual matchup scores can be inaccurate for a variety of reasons, but the overall results are generally reasonable.
The Overview and Search tabs are fairly self-explanatory. The Draft tab allows two different options: Table and Swap. For the Table drafting, make sure you enter the correct IVs for your Pokemon to get the most accurate results. If your Pokemon has random IVs (possible in Rounds 8 and 9 of Open Level), selecting "Random" will treat it as if it were 3IV. For Swap, if you don't know the opponent's set, you can select which ones are possible based on what moves you saw, or select "Any", and it will summarize which swaps should be beneficial. Both Table and Swap use the "Best Answer" scoring for teambuilding: the team's score against a matchup is the highest individual matchup score of the three Pokemon on that team. Individual averages are also shown, to see which Pokemon are individually the strongest options.
Right now, the teambuilding is only for the "General Score" using the average frequencies of sets. Support for the "Counter Score" using Type/Phrase information will be added soon. If there are any other features that you feel are missing, please let me know, either via email (njkmath@gmail.com) or by joining my Discord: https://discord.gg/T7B5rHp2ef