Wow, that's commited with the dialga =O
Unfortunately we don't have any leader spots open at the moment, we already have our twelve leaders, but if you want to be a challenger your very welcome!
Hey, welcome to Serebii!
The Theme League is a group of Serebii battlers who've teamed up to make 8 gym leaders and an elite four. Anyone can challenge us to wifi battles, and whenever you win there are prizes available, as well as prizes for beating the whole League.
All the info you need, such as the rules, info about the leaders and prizes can be found on the first post of the Theme league thread, but if you have any other questions, feel free to ask =)