Alright, so you're going to want to choose one of the six stats to compete with: HP, Attack, Defense, Sp. Attack, Sp. Defense, and Speed. All of the pokemon in your team will have to have this stat as their highest base stat. So, for instance, if you were doing a Sp. Defense run on R/B/Y, you might like having Blastoise and Ninetales on your team. Or, if you were doing HP, you might want Nidoqueen and Chansey. Make sense?
Here is the link to pokemon listed by base stats:
http://bulbapedia.bulbagarden.net/wiki/List_of_Pok%C3%A9mon_by_base_stats
I understand that some pokemon have two equal base stats that are the highest, such as Venesaur, who has 100 in both Sp. Attack and Sp. Defense. If you find any pokemon like this, they may be used for either stat.
You may hack or trade in your pokemon if you don't have your first pokemon for your stat before the first gym, but other than that, don't use any cheating devices.
Legendaries are not allowed, as they often have much higher stats and would make gameplay easier than it should be. (Unless it is in B/W, in which case you can use Reshiram/Zekrom actively on your team, as long as they match your stat) Also, you don't have to have six pokemon on your party, but the minimum is four.
There is an ultitimate challenge, where, as usual, you complete one stat in all regions. And, yes, you may choose your own team. Once you do, I will check to see that all your stats match up, and then you will be added to the competitors list.I expect an update atleast once a week on your progress unless you have a good reason as to why not (Which you can explain in your post). You can also add screenshots if you would like, although it is not needed.
The challenge ends when you defeat the elite four, or for b/w, when you defeat alder and cynthia, or in g/s, you defeat red.
Now, sign ups!