7th Gen I need help with team building

[JDSour]

I recently started another playthrough of UM, wanting to use different Pokemon than I did on my first go at it. Currently my team consists of:
Charjabug
A-Grimer
Furfrou
Flareon
Brionne


I received a Mareanie in a Wonder Trade with a good nature and all of the egg moves it learns, and I am really considering switching out Brionne for it. Is Mareanie any good, and would it fit within my current team? And any other suggestions for the 6th member of my party?

 

[Nah]

What Pokemon did you use the first time, so we don't recommend things to you that you've already used

Mareanie/Toxapex makes for a good defensive Pokemon

 

[JDSour]

My last team consisted of:
Incineroar
Totem Raticate (for the lols)
Salazzle
Oricorio-Poms
Azumarill
Crabominable
Currently I'm on Route 5 on Akala Island, my team is level 18-20

 

[Nah]

Ok.

You can get a Hawlucha very early in the game, and it's pretty good for most of the game and so is worth considering for your last team slot. Something with a priority move that's super-effective against Dragon or Psychic is also worth getting too. Not that I remember specific things that have that in US/UM lol

 

[JDSour]

Hawlucha makes a lot of sense, I was dwelling on a fighting type too. It will balance the team out pretty well.