Your team looks pretty weak to Dragons in general, since you don't have any Steels or really bulky Pokemon outside Arceus (which haven't got any investment on it). Something like Scarf Palkia/Reshiram/Zekrom/Salamence all look extremely threatening. Your checks to them are pretty damn shaky. Salamence can be especially painful if it revenges Zekrom locked into Outrage, since it can just snowball your ass. You do have priority, I guess, but you can imagine if someone starts spamming two or more dragons (which isn't rare at all), you're going to be in a pretty bad shape. Unfortunately, there isn't much of a fix for this unless you want to be like me and use Bisharp (lol) except smart play, but since you're good enough to get to #1, you could probably do that anyway.
Anyway, congrats on #1, good team and good luck.
Whatevs sig. QC member for OU and Ubers, VM me for a look at your analysis. Just make sure it's good.
Also, if you want me to rate your team (OU/DW OU/Ubers), give me a VM. If I don't rate it, it's either 1) it's so shit it's too much trouble, 2) I'm busy, or 3) the team is fantastic and I have nothing I can suggest to you. You should be able to recognise which one.