[X] My Assistant

[Lester Burnham]

Gardevoir
Pokedex #: 282
Type: Psychic
Bases:
HP 68 ATK 65 DEF 65 SP. ATK 125 SP. DEF 110 SPD 80
Total: 513
Tier: Borderline

Strengths: Fighting, Poison
Weaknesses: Bug, Ghost, Dark
No Effect Against: Dark
Resistances: Fighting

Abilities:
Synchronize: When Gardevoir becomes Poisoned, Paralyzed, or Burned, the other Pokemon is also Poisoned, Paralyzed, or Burned. Does not work if the opponent's Pokemon is resistant to that status change.
Trace: Gardevoir copies the opponent's ability. Trace is restored if Gardevoir is switched out.

Sweeper Sets

1: Your everyday sweeper

Gardevoir@Life Orb
Modest
[[Synchronize]]
252 Sp. Atk/252 Spd/6 HP

Psychic
Grass Knot/Energy Ball/Magical Leaf
Thunderbolt/Focus Blast/Shadow Ball
Toxic/Will O'Wisp/Thunder Wave

Gardevoir has better coverage than Kazam in some situations because it learns TBolt and Will O'Wisp over Kazam. It's defenses are also better so it lasts longer except against CB Weavile. I recommend GKnot again for the same reason it fits on Zam: it kills TTar and bulky waters. Shadow Ball hits Azelf and Gengar, and maybe Spiritomb if you're lucky. Any status move is good here.

2: Choices, choices.

Gardevoir@Choice Specs
Modest
[[Synchronize]]
252 Sp. Atk/252 Spd/6 HP

Psychic
Focus Blast
Thunderbolt/Shadow Ball
Grass Knot/Energy Ball

Specs helps Gardevoir's attack power. You want to hit hard in this set, so you want all attack moves. This gives great coverage and high power to boot against everything not named Blissey.

Wall Sets

3:Walled annoyer

Gardevoir@Focus Sash
Calm/Sassy
[[Synchronize]]
252 Sp. Def/252 HP/6 Def

Thunder Wave/Will O'Wisp/Toxic
Thunder Wave/Will O'Wisp/Toxic
Torment
Psychic

Two status moves help here because you annoy and wall at the same time. I suggest Will O'Wisp for one because nobody likes burn. >:)
Torment prevents CB Weavile from hacking you with the same move and also prevents Subpunchers from cursing like crazy.

4: Just a wall

Gardevoir@Focus Sash
Calm
[[Synchronize]]
252 Sp. Def/252 HP/6 Sp. Atk

Light Screen
Torment
Psychic
Reflect/Safeguard/Will O'Wisp

Defense based here. Psychic is just there because we all need at least one attack.

Annoyers

5: Multiple status sets R fun!

Gardevoir@Focus Band
Calm
[[Synchronize]]
252 Sp. Def/126 Spd/126 HP/6 Def

Toxic/Thunder Wave
Will O'Wisp
Skill Swap
Psychic

Basically your everyday annoyer. You don't need all three status inflicters, but be my guest if you want to. SS is there because you can really help especially against wonderguard spiritomb or hurt, so use with caution.

6: Hypnosis combos R fun too!

Gardevoir@Life Orb
Modest/Timid
[[Synchronize]]
252 Spd/252 Sp. Atk/6 HP

Hypnosis
Dream Eater
Nightmare
Psychic

Use this set sparingly because of Sleep Clause/Dark Types. However, it's great for recovery/attacking hard while your opponent is in dreamland.

Other Options:
From breeding, Gardevoir learns moves like Confuse Ray and Destiny Bond, so those are great in almost every moveset. Remember that WillOWisp is also a breed move.

Counters:
Weavile: Voir's low movepool makes Weavile that much more dangerous. So watch out.
Metagross and Bronzong: Gardevoir has lower power than their defenses, but Will O'Wisp helps because they take damage while being Toxic-resistant.
Blissey: Focus Punch is absent from Gardevoir's set, so Bliss is a whore here, especially with Aeromatherapy to eliminate your status infliction.
TTar: Grass Knot helps here, but TTar is always a bitch because of its resistances.

Final Thoughts:
After writing this, I think Gardevoir is better than Kazam. But it's BL for a reason, because of it's poor pool. But it's still noteworthy because of it's rounded-out stats.

[Richard and Blaz...]

The Gardevoir moveset I use is:

Gardevoir@ Leftovers
{Trace}
Modest nature (+Sp. Attack, -Attack)
EVs: 252 HP/ 200 Defense/ 58 Sp. Defense
Psychic
Wish
Calm Mind
Thunderbolt

This set works best when a Sub is passed onto Gardevoir, but it can work well without it too. Calm Mind can boost it's Sp. Attack and Sp. Defense at once, making it a more potent threat, and stronger against Special Attacks at the same time. Wish can help heal up Gardy's damage, and Gardy can switch out to pass a Wish to a team-mate in need. Psychic and Thunderbolt make a good duo of attacks to sweep with, but what really makes Gardevoir shine is her rare ability, Trace. Trace can give Gardevoir wonderful opportunities to switch in that otherwise, it wouldn't have. It can switch into Water Absorb Pokemon using Surf (or another Water type attack), Volt Absorb Pokemon using an Electric attack, Flash Fire Pokemon using a Fire attack, Motor Drive Pokemon using an Electric attack, Intimidate Pokemon to Intimidate them, cutting the damage they'll do to her physically, which can be a big help, due to her low Defense stat, among many other abilities.

Just thought I'd add something. =)