My top three choices would be Pokémon Anime, Art Gallery and Pokémon Groups.
Pokémon Anime
I'm like hearing things about the anime and people's opinions on different aspects and the shippings always make me laugh (in the good way, I like shipping).
Art Gallery
I've always been interested in art and I've been trying to find some free time to get back into it again. Seeing other fanart and Fakemon usually motivates me too.
Pokémon Groups
The Pokémon Groups section looks pretty simple to manage. It seems like there wouldn't be a huge amount of ridiculous threads so I'd have time to check through them properly.
Of course, this is all if I had to choose a section. Honestly, after a few years at moderating on different sites, I realise how difficult it is. While at times, it's great, it can often feel like a chore. On such a large site, I'd find it particularly difficult to motivate myself, especially with exams and everything else that's happening in my life.