Hey I have 9 badges, I just beat the elite four and i need two more pokemon to complete my team. So far I have

lvl56
lvl58
lvl 59
lvl 58

I also have a lvl 76 Feraligatr but i don't really want to use it. I was thinking of getting a milotic or maybe a spiritomb or garchomp or salamence....any suggestions are welcome. thanks

I think I would suggest a Steelix, and you can catch one on your way to the safari zone, it'll need some training. And if you go closer to the safari zone i don't think it would be a bad idea for you to snag a Gloom or something and train it up, or just go to the safari zone? take the owners test [it's not long or hard or anything] And once you can arrange the areas on your own grabbing a Haunter probably could work.

i would suggest a psychc pokemon too. Because when you are that far that you are going on Elite4 the second time, a good psychc can do both Poison-man and Bruno the fighting man

i know you only had 9 badges, but when you got all 16 try a mewtwo maybe.

thinking about the elite 4...

you got tyranitar to do bronzong, charizard to do gardevoir, then switch between charizard and tyrantiar as your liking for the rest on "psychc phil"
tyranitar (atleast my learned it) does probably got earthquake for skuntank, PSYCHC pokemon for the rest there...
psychc/flying against Fighting Bruno P.S. Do not use flying against Machamp.
Tyrantitar and charizard for Darkside, except gyarados for houndoom

champion is kinda up to your choise there

so what you need is a PSYCHC pokemon. maybe an ice too, for the champion.

got both, so maybe give that a shot to train up?