On the fast Spiker set maybe slash Knock Off in the fourth slot. Night Shade is not accomphishing much except giving you a move when (in an unlikely circumstance) get taunted. Most Rapid Spinners carry Leftovers as their item of choice and if you just use a quick knock off they will be worn down trice as quickly. Almost all Pokemon can't stomach having their item taken away. Knock Off gives a lot more utility than Night Shade and judging by Myzozoa's post Magic Coat is a very situational move.
I can attest to the usefullness and successfullness of the bulky spiker set, so I would be quite dissapointed if it got droppoed to OO. It is deoxys-d's best set outside of hyper offensive teams. While it can be used well on balanced teams, it finds it true home on stall teams. First, it is the only good defensive spiker in the tier that isn't weak to fire (cloyster is terrible on defensive teams). This is important because it prevents the stacking of fire weaknesses, which often occurs because stall teams incorporate multiple steel-types (for dragons) and a grass type (take rain water attacks). However its big claim to fame is countering reuniclus and beating it 1 vs 1 which is why Night Shade should be staple. Move that Stealth Rock slash up to become second to spikes. This is just incase it would be more suitible for spikes to be set up by another pokemon on the team. For example if you paired deoxys-d with skarmory, it is better to put SR on deoxys-d because it can set up against a much wider variety of targets like sun teams (which skarm wold struggle to do). Having a decetly fast taunt is also something stall teams desire to prevent set up (especially hazards). PP stalling is also very nice too. It very scared of toxic so a cleric and a grounded poison-type (tentacruel) are its best partners.
I can attest to the usefullness and successfullness of the bulky spiker set, so I would be quite dissapointed if it got droppoed to OO. It is deoxys-d's best set outside of hyper offensive teams. While it can be used well on balanced teams, it finds it true home on stall teams. First, it is the only good defensive spiker in the tier that isn't weak to fire (cloyster is terrible on defensive teams). This is important because it prevents the stacking of fire weaknesses, which often occurs because stall teams incorporate multiple steel-types (for dragons) and a grass type (take rain water attacks). However its big claim to fame is countering reuniclus and beating it 1 vs 1 which is why Night Shade should be staple. Move that Stealth Rock slash up to become second to spikes. This is just incase it would be more suitible for spikes to be set up by another pokemon on the team. For example if you paired deoxys-d with skarmory, it is better to put SR on deoxys-d because it can set up against a much wider variety of targets like sun teams (which skarm wold struggle to do). Having a decetly fast taunt is also something stall teams desire to prevent set up (especially hazards). PP stalling is also very nice too. It very scared of toxic so a cleric and a grounded poison-type (tentacruel) are its best partners.