I am actually encouraging one Dark Horse per player (in the OP), because I really want users to get a feel for their Dark Horse Pokemon in order to achieve a notable goal. I fear that multiple Dark Horse Pokemon blurs that research and can be difficult for new battlers to OU.
And at the end of the day, a user with multiple Dark Horse Pokemon will theoretically gain more recognition in the Hall of Fame! If the list becomes overly burdened and needs some organization, I'll consider your suggestions. Thanks for helping me bounce around some ideas! Hope to see you do well with Aggron =D!
Somewhat for organizational purposes, it looks messy at present with the multiple Pokemon, but primarily because the main thrust of the challenge as its been received is to do it with one Pokemon, and each group, 1, 2 or 3 pokemon shouldn't be burdened with the others. If anything, separate the three to provide more recognition to those who succeed with more dark horses on their team.
Good idea, but I think I'm going to pass! The Dark Horse Project is about choosing a Dark Horse Pokemon of your choice and then running with it. If I categorized the information, users might be discouraged from taking Metagross, for example, simply because there are plenty of other users gunning for him in the Hall of Fame. The project is about people choosing a Dark Horse that they want, not the least popular ones. I hope that clarifies it!