I have been using this as a lead for my hyper-offensive team:
Deoxys-D @ Choice Scarf
EVs: 252 HP / 4 SDef / 252 Spd
Timid Nature (+Spd, -Atk)
- Stealth Rock
What many people are tired of complain is how Deo-D teams are destroyed by things like Double Dance Thundurus-T and Volcarona. This set attempts to fix this problem. Your opponent will never see that coming: Trick a Choice Scarf on the opponent, and they will be instantly locked on their setup move. It is funny to see how the opponent instantly rages when they see their Volcarona locked on Quiver Dance, their Thundurus-T locked on Agility, their Terrakion locked on Rock Polish, etc.
This set isn't useless apart from surprising setup sweepers. It has a lot of utility outside that. For example, you can use Trick against a Rapid Spinner. While this does not prevent them from using Rapid Spin to spin away your hard work, at least this can make them think twice before spinning, as you can take advantage of this to have a free switch to almost anything you want, for example, a setup sweeper of your own.
I have a problem with this set, however. I don't know which would be the best option on the last slot. I have been using Taunt, but sometimes disabling the opponent with Choice Scarf + Trick was sufficient, and being locked on Taunt was never a good idea on the first place. Speaking of which, this is the main problem of this set; it tends to have problems if you don't Trick away the Choice Scarf first. This is alleviated by the fact that Spikes is one of the moves being used, and Deoxys-D can usually afford to be locked on Spikes.