I was just browsing on my first look on the forums, saw this thread and felt I had to say something for the following reasons:
All your pokemon (with the exception of Umbreon) are set up as Sweepers - this means that they have 4 attacks (in the case of your team) and are designed to be as affective against as many types as possible. This works fine when getting you through the game, but online it will be a different story.
What really drew me to this though were the inclusion of two fabulous pokemon on your team, Umbreon and Skarmory, however they're not neccesarily compatible. Although the move sets I'm about to show you are pretty standard, they are freakishly effective.
(Note: Both these sets are much better with EVs. Your welcome to PM me for them, but for now I thought I'd keep things as simple and accesible as possible!)
Firstly Umbreon.
Umbreon
Mean Look
Baton Pass
Toxic
Moonlight
Preferably, you want a personality that boosts one of it's defences. This things needs to stay alive.
How it works is that the effects of mean look can be baton passed. This means that you can change pokemon and the opponent can't escape! You can hit them up with Toxic, to make things easiar for your sweeper too(if Umbreon is in a position to take a hit). A Lum Berry would be a good item here, as you want to preserve your life as much as possible, and something like toxic would be a nightmare.
You can take this combination further if you wanted - you could baton Pass to a Trick-Bander. A trick bander is a pokemon wih trick and choice band, meaning that the pokemon is stuck using the same move over and over, whilst you get their item. This is a little hard to pull of however, as it's all down to predicting. Fortunately, most of the pokemon that can do this are Pychic, with high Special Defence, meaning that if a Special move, or a non-damaging move (the preference, obviously) is used then you can keep your tricker in. A great choice with your squad would be Mr Mime, as he can Calm Mind up 6 times to maximise your Special Attack and Special Defence, then baton Pass to your Empoleon, giving you a special Sponge like Special Sweeper. Like I said, tricky to pull off, and with your team you'd need to change a pokemon (Which might be advisable as you only have one special attacker if you change Umbreon's set), but fiendishly powerful if it works. I'd prefer a faster pokemon as my special sweeper personally, but it's all down to taste, and Empoleon is a cracking pokemon.
My favourite strategy for Skarmory doesn't quite work with Umbreon, as it revolves around switching rather than keeping your foe in, however I'm including it to give you several options. Here is the set:
Skarmory
Spikes
Roar
Toxic
Drill Peck
So, use spikes, and keep roaring to switch your foes on to them. You could also Add Toxic before you roar and cripple their entire team. Skarmory has a huge defence stat and not alot can hurt it. Plus it only has two weaknesses. This can be one dangerous and annoying pokemon, however it really needs EVs to work, to help it take special hits.
Anyway, just some thoughts. Sorry if it was a bit long and hope I wasn't too forceful with my opinion! But like I said, I had to comment on those two pokemon: Umbreon is my favourite and Skarmory is a prime cnadidate for a team I'm working on myself. Let me know what you think, and feel free to PM me if I've been really confusing!