Question

-Six Pokemon are required and while legendaries can be suggested, do remember that many people do not like using them because of how easy it makes the game. You might also want to keep the starter.
-Moves are required for each Pokemon.
-You should make sure to take into account that some people cannot trade, nor do they want to use cheating devices such as AR. As such, suggesting Darkrai is not the best idea.
-Items, EVs, and Natures are not required.
-Please provide ample explanation.

Comments

are'nt in game teams not allowed?

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Pokemaster is allowing Q's for games, but only one each. Just noting, don't go asking your own.

Answer 1

Mostly Citadark Team: Espeon, Tauros, Salamence, Dewgong, Tyranitar, Ninetales

Espeon: Helping Hand, Psychic, Protect, Psybeam
-Shame that the Eeveelutions have poor movepools in XD (even Vaporeon, due to lack of Surf or Muddy Water). Helping Hand helps support, Protect dodges Earthquake. Psychic and Psybeam are STAB, stacked to provide more PP.

Tauros: Return, Earthquake, Protect, Iron Tail
-Intimidate is very helpful in Double battles. It also gets Earthquake without needing the TM, meaning the TM can be saved for others. This is very useful. Return is STAB. Protect is to dodge Earthquake. Iron Tail is coverage, mainly for when I donb't want to use Earthquake.

Salamence: Dragon Dance, Aerial Ace, Earthquake, Flamethrower
-Another Intimidate user, although this one is a Flying type, meaning it is already able to dodge Earthquake without need for Protect. Aerial Ace is STAB. Earthquake is coverage that hits everything. Flamethrower is coverage, which is boosted by Ninetales.

Dewgong: Surf, Protect, Icy Wind, Blizzard/Ice Beam
-Surf is STAB that hits all the foes. Protect is to dodge Earthquake. Icy Wind hits all the foes and slows them down, allowing you to hit them first. Blizzard and Ice Beam are STAB. Blizzard is less accurate, more powerful, and has less PP. Its main advantage is that it can hit all the foes. Ice Beam is more accurate and has higher PP though.

Tyranitar: Earthquake, Rock Slide, Protect, Crunch/Flamethrower
-Earthquake is coverage that hits all the foes. Rock Slide is STAB that hits all the foes. Protect is used to dodge Earthquake. Crunch is STAB that hits on the Special side, although Flamethrower can be used for coverage with help from Ninetales.

Ninetales: Heat Wave, Protect, Sunny Day, Solarbeam
-Heat Wave hits all the foes. Sunny Day boosts Heat Wave, as well as the Flamethrower of Salamence and perhaps Tyranitar, while also removing Solarbeam's need to charge. Solarbeam is coverage. Protect is used to dodge Earthquake.

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Answer 2

Before Citadark Team: Espeon, Dewgong, Tyranitar, Ninetales, Dusclops, Flygon

Espeon: Helping Hand, Psychic, Protect, Psybeam
-Shame that the Eeveelutions have poor movepools in XD (even Vaporeon, due to lack of Surf or Muddy Water). Helping Hand helps support, Protect dodges Earthquake. Psychic and Psybeam are STAB, stacked to provide more PP.

Dewgong: Surf, Protect, Icy Wind, Blizzard/Ice Beam
-Surf is STAB that hits all the foes. Protect is to dodge Earthquake. Icy Wind hits all the foes and slows them down, allowing you to hit them first. Blizzard and Ice Beam are STAB. Blizzard is less accurate, more powerful, and has less PP. Its main advantage is that it can hit all the foes. Ice Beam is more accurate and has higher PP though.

Tyranitar: Earthquake, Rock Slide, Protect, Crunch/Flamethrower
-Earthquake is coverage that hits all the foes. Rock Slide is STAB that hits all the foes. Protect is used to dodge Earthquake. Crunch is STAB that hits on the Special side, although Flamethrower can be used for coverage with help from Ninetales.

Ninetales: Heat Wave, Protect, Sunny Day, Solarbeam
-Heat Wave hits all the foes. Sunny Day boosts Heat Wave, as well as the Flamethrower of Flygon and perhaps Tyranitar, while also removing Solarbeam's need to charge. Solarbeam is coverage. Protect is used to dodge Earthquake.

Dusclops: Will-o-wisp, Protect, Shadow Ball, Blizzard
-Blizzard hits all the foes. Protect dodges Earthquake. Shadow Ball is STAB. Will-o-wisp bruns the foe.

Flygon: Earthquake, Flamethrower, Dragon Claw, Giga Drain
-A Pokemon with Levitate, great for Doubles. Earthquake is STAB that hits all he foes. Flamethrower is coverage that gets boosted by Sunny Day. Dragon Claw is STAB. Giga Drain is coverage.