Competitive Team Advice/Ideas

[SkyriderCarlyle]

I kinda want to get into competitive battling, and I was thinking why not post my team to experts, or at least vets. So far I have my starting trapsetter, Roserade, with Toxic Spikes, Ingrain, Leech Seed, and Giga Drain. After Petal is Mega Gardevoir, knowing Hyper Voice, Psyshock, Thunderbolt, and Will-o-Wisp. Next up is Garchomp, with Dragon Rush, Rock Slide, Earthquake, and Outrage. Following is Aggron, knowing Dragon Rush, Head Smash, Super Power, and Iron Head. I have no Sixth, I am trying to decide between Umbreon, Noivern, Typhlosion, Eelektross, Bronzong, Tyrantum, Bisharp, Chandelure, Sceptile, Yanmega, Nidoking, Trevenant, and Florges, all with no definitive moveset. Suggestions, advice, critiques, and various other opinions are welcome.
Thanks,
--SkyriderCarlyle--

 

[PorkyTheKing]

Tyrantrum is a good spike setter.
The moveset I found good had some sort of rock headbutt with recoil. It helped quite a lot.
Elektross has the weakness removal, of course. But that's all I know he's got going for him.
I don't really know much about competitive play, but that's what worked for me.

 

[Artisan]

I like your typing choices. They are immune to status and have good coverage. The one think you last is some survivability in case you have trouble against a stall team. Your ways to inflict status are fine but you can run out of Pokemon faster if you find yourself constantly switching out and you cannot use Roserade your Pokemon will gradually meet their demise. Of course it's imo and items could solve that problem. Espeon will give Roserade trouble right off the bat and it's a common Pokemon so I would suggest a specially offensive Eelektross and Umbreon out of the Pokemon you have chosen but I'd recommend Chansey and Hippowdon to set up sandstorm. I'm less sure on Chansey and I haven't been playing pokemon a lot though so that could be just me.