I am in Hearthome Gym and I thought "Oh crap what was my 6th member going to be?" I looked for the paper I wrote my team down on awhile ago and lost it...

Current Team:
Monferno - Fire/Fighting
Drifblim - Ghost/Flying
Pachirisu - Electric
Floatzel - Water
Roselia - Grass/Poison

Should I use a 6th member? If yes, what Pokemon; Sinnoh only Pokemon; if no thanks for helping *not being sarcastic*

*Note my team is for in-game use only and covers 8 different types.

Pachirisu sucks, get Rotom instead.

The most useful type in my opinion in this game is eather Ground or Fighting, and since you have Monferno I recamend Mamoswine.

Dude, it's still really early in the game you shouldn't fill up your team so early.

The earliest ground type you can get is either rhyhorn or hippopotas.

I recommend using Hippopotas.It is really good.

Could always go simple and throw in Onyx to evolve later. Do you need anything in particular? Are you specifically trying to beat it without any trades? If not, I could send you most any non-uber to fill your team how you see fit.