Hey man, I'm afraid you can't. There is already a thread about Deoxys-Speed and has been reserved already. Here is the current analysisCan I reserve Deoxys-Speed? Not much needs to be done for it, but there are a few things which I think should be done after the transition to ORAS.
What Pokémon are still unreserved?
Go aheadI'd like to take over Kanga if I have permission.