I'm sure you'll get better answers than mine but for starters consider replacing Kricketune and Delcatty, as they're overall not very usefull against Shelly. Good substitutes would be a sturdy Onix, or a moxie Pyroar. Alternatively you could use Klang, Macgargo, Nidorino, Dodrio, sturdy Donphan, sturdy Graveler, and Lunatone/Solrock. An Ampharos would be able to deal with her Masquerain and with the move power gem it'd would also be pretty useful against the rest off her mons. Bur mainly replace those two, and I think it would suffice. I know the level cap is at 35, and that some of the mons i suggested evolve at 38, but it's far better to use a couple rare candies on grimer ie, and then level it down with common candies, than having an unevolved pokemon.
EDIT: I understand, you're new to the forum, and I also made a similar mistake on my first post, but the content of your post is better suited for the Team Showcase forum, and to be more specific this thread. Other than that, have fun playing Reborn!