Oh, let's see...
People tend to max out HP for maximum general bulk, but the other stats are for their preferences. In some cases, some players like using Bold Deoxys with 252 HP / 252 Def for physical bulk, or vise versa for Special bulk (mainly because Deoxys-S has already incredible Speed). If you need to outrun certain scarved threats like Darmanitan, the Speed EVs can be adjusted so.
For moves, just go with Light Screen | Reflect | Magic Coat | Stealth Rock / Psycho Boost with Light Clay.