When I make my teams, I start by choosing a few pieces that I like for whatever reasons of personal preference. Gimmicky movesets, aesthetic appeal, or nostalgia usually play a factor in this. Also, I usually like to shy away from standards such as Blissey and whatnot - not just for unique kitsch factor but also to keep my opponent from having a good idea of what I'm doing. After I have these first few pieces set, I'll build synergy around it to make a cohesive unit that can be at least moderately competitive. For this team I started with Umbreon, who has been looked at less positively in this generation. His STAB Pursuit becoming a physical attack now is very appealing with Screech - especially if you gain something from forcing switches. Obviously this implies Stealth Rock and Spikes. Normally, I hate "TSS" style teams since they are comprised of predictable, slow, and generally overused boringness. However, when I saw that Diamond/Pearl offered some sleeker new alternatives for auto-damage field effects, I set up with this as my base:
Azelf @ Undecided
Stealth Rock
Explosion
Psychic
Flamethrower
Frosslass @ Focus Strip
Spikes
Destiny Bond
Thunderbolt
Ice Beam
Umbreon @ Leftovers
Screech
Pursuit
Wish
Protect
First, let me explain my unorthodox choices for Spiking/Stealth Rocking. First, Azelf is expected to be a speedy sweeper who threatens Explosion. Having him start off by throwing out Stealth Rock should hopefully catch them off guard as they switch in Blissey or Crescelia in anticipation of Scheme. Like Azelf, Froslass is very quick and threatens some degree of special attacking. After getting off some Spikes he has the added benefit of taking someone with him through Destiny Bond or blocking Rapid Spin due to Ghost typing. With the proper speed and special attack EVs (and Focus Strip), there is no way Frosslass should not be able to deal with Garchomp.
So with this base, I have Spikes/Stealth Rock and a nice tank who proactively forces switches. Another one of my favorites, Articuno, instantly came to mind as a Special Attack tank who could also force switches. Some combination of: Ice Beam, Roar, and then Rest/Sleep Talk or Feather Rest, Reflect, and Heal Bell seems quite nice. While the Sleep Talker can Roar more reliably than the others, a moveset with Feather Rest frees up a slot for Heal Bell or Reflect. On a side note, Mind Reader/ Sheer Cold would also be very effective at forcing switches if OHKO is ever allowed. For now, I will tentatively pencil in this set:
Articuno @ Leftovers
Ice Beam
Roar
Reflect
Feather Rest
Now in the last two slots is where I am having a bit of trouble. Though Azelf is a mini-special attack threat, I would like a strong special attacker and a strong physical attacker to fill the last two slots. Some other things to keep in mind would be: Ghost typing to block Rapid Spinning, bulky stats or Intimidate to augment the defensive nature of the team, status effects such as Thunder Wave and Will of the Wisp, Tyranitar for the added chip damage from Sandstorm, and further utility such as Heal Bell (assuming Articuno doesn't have it), Rapid Spin (nearly required to protect Articuno), and Taunt.
The first tandem I tried using to fill the last two slots included Starmie and Gyarados. Starmie is a fast Special attacker who can Rapid Spin, while Gyarados is a bulky physical threat. However, this obviously gave the team a glaring weakness to a speedy Thunderbolt. In terms of straight up attackers, I'm very fond of Life Orb Infernape (with Mach Punch to answer a glaring DDTar weakness) and Choice Glasses Salamence. However, I don't know if I can afford to just have pure beef attackers considering how much needs to be covered by the last two slots (though Salamence is quite bulky himself). Gengar also came to mind, as Hypnosis and Will of the Wisp fill a needed role while blocking Rapid Spin and threatening as a special attacker. Dusknoir is another Ghost to consider, and can potentially fill the role of Physical attacker while being very defensive. I have also given thought to Flygon as a physical sweeper, with Screech as added synergy to force switches. Similarly, the special attacker might consider Metal Sound for obvious reasons.
Given the four set in stone members and the established theme of the team, how should I fill the last two slots considering the aforementioned roles that they need to fill? I can deal with Garchomp, Salamence, and Gyarados fairly well, but Tyranitar seems to be posing big problems. Umbreon does a fairly adequate job of walling other non-stat upping sweepers, while I can ignore their tanks due to the nature of my team.
Azelf @ Undecided
Stealth Rock
Explosion
Psychic
Flamethrower
Frosslass @ Focus Strip
Spikes
Destiny Bond
Thunderbolt
Ice Beam
Umbreon @ Leftovers
Screech
Pursuit
Wish
Protect
First, let me explain my unorthodox choices for Spiking/Stealth Rocking. First, Azelf is expected to be a speedy sweeper who threatens Explosion. Having him start off by throwing out Stealth Rock should hopefully catch them off guard as they switch in Blissey or Crescelia in anticipation of Scheme. Like Azelf, Froslass is very quick and threatens some degree of special attacking. After getting off some Spikes he has the added benefit of taking someone with him through Destiny Bond or blocking Rapid Spin due to Ghost typing. With the proper speed and special attack EVs (and Focus Strip), there is no way Frosslass should not be able to deal with Garchomp.
So with this base, I have Spikes/Stealth Rock and a nice tank who proactively forces switches. Another one of my favorites, Articuno, instantly came to mind as a Special Attack tank who could also force switches. Some combination of: Ice Beam, Roar, and then Rest/Sleep Talk or Feather Rest, Reflect, and Heal Bell seems quite nice. While the Sleep Talker can Roar more reliably than the others, a moveset with Feather Rest frees up a slot for Heal Bell or Reflect. On a side note, Mind Reader/ Sheer Cold would also be very effective at forcing switches if OHKO is ever allowed. For now, I will tentatively pencil in this set:
Articuno @ Leftovers
Ice Beam
Roar
Reflect
Feather Rest
Now in the last two slots is where I am having a bit of trouble. Though Azelf is a mini-special attack threat, I would like a strong special attacker and a strong physical attacker to fill the last two slots. Some other things to keep in mind would be: Ghost typing to block Rapid Spinning, bulky stats or Intimidate to augment the defensive nature of the team, status effects such as Thunder Wave and Will of the Wisp, Tyranitar for the added chip damage from Sandstorm, and further utility such as Heal Bell (assuming Articuno doesn't have it), Rapid Spin (nearly required to protect Articuno), and Taunt.
The first tandem I tried using to fill the last two slots included Starmie and Gyarados. Starmie is a fast Special attacker who can Rapid Spin, while Gyarados is a bulky physical threat. However, this obviously gave the team a glaring weakness to a speedy Thunderbolt. In terms of straight up attackers, I'm very fond of Life Orb Infernape (with Mach Punch to answer a glaring DDTar weakness) and Choice Glasses Salamence. However, I don't know if I can afford to just have pure beef attackers considering how much needs to be covered by the last two slots (though Salamence is quite bulky himself). Gengar also came to mind, as Hypnosis and Will of the Wisp fill a needed role while blocking Rapid Spin and threatening as a special attacker. Dusknoir is another Ghost to consider, and can potentially fill the role of Physical attacker while being very defensive. I have also given thought to Flygon as a physical sweeper, with Screech as added synergy to force switches. Similarly, the special attacker might consider Metal Sound for obvious reasons.
Given the four set in stone members and the established theme of the team, how should I fill the last two slots considering the aforementioned roles that they need to fill? I can deal with Garchomp, Salamence, and Gyarados fairly well, but Tyranitar seems to be posing big problems. Umbreon does a fairly adequate job of walling other non-stat upping sweepers, while I can ignore their tanks due to the nature of my team.