Bellibolt is a pure Electric type, is the evolution of Tadbulb, and has a fairly great shiny. Now when it comes to battling, it may not be as great, but it does still have alright stats, decent enough abilities and an okay movepool. I would say its move variety is probably where it does lack the most, but Bellibolt is more a bulky pokemon than an attacker, although it can still have its niche in playthroughs if wanting a good specially attacking electric type. Overall, I love this squishy electric pokemon, and don't mind the gym leader that uses Bellibolt either, but I just didn't feel right putting this in my top 20, which is why it got this spot instead.
Pokemon Left:
Meowscarada
Skeledirge
Quaquaval
Lokix
Daschbun
Garganacl
Armarouge
Ceruledge
Mabosstiff
Tinkaton
Cetitan
Annihilape
Clodsire
Dudunsparce
Kinggambit
Great Tusk
Flutter Mane
Chien-Pao
Iron Valiant
Miraidon