Moves
Gallade's strong Close Combat threatens the many Fighting-weak Pokemon in DPP OU, such as Tyranitar, Clefable, Heatran, and Empoleon. Close Combat also has pretty good neutral coverage on the tier and 2HKOes foes such as Flygon, Scizor, and Machamp. Will-O-Wisp is excellent for hampering bulky Pokemon such as Jirachi, Swampert, Metagross, and Zapdos with a burn. Will-O-Wisp makes Gallade challenging to switch into without a Lum Berry and a resistance to Fighting, as Gallade outspeeds and OHKOes Clefable and Heatran.
Taunt makes it much harder for the foe to shrug off Close Combat and Will-O-Wisp by preventing defensive Pokemon from healing. Taunt also makes Gallade serviceable for preventing Stealth Rock and other set-up from slower leads such as Swampert, Hippowdon, Skarmory, and Breloom, but beware that these leads all take advantage of Gallade's frailty. Ice Punch completes Gallade's coverage by OHKOing Dragonite, 2HKOing Gliscor, and at least 3HKOing defensive Latias and Zapdos. Another option is to forgo the coverage and use Destiny Bond to guarantee Gallade takes slower foes down with it. Despite Gallade's average Speed, it outspeeds slower offensive Pokemon such as Metagross and Swampert that might aim to attack into Gallade to take advantage of Close Combat's Defense drop or avoid Taunt.
Set Details
A simple EV spread of 252 Attack EVs and 252 Speed EVs maximizes Gallade's offensive potential to hit as hard as it can. It notably needs almost maximum Attack investment to OHKO Dragonite with Ice Punch. While an Adamant nature is appreciated for power, Gallade sits as a crowded speed tier and really needs a Jolly nature to outspeed Gyarados, Breloom, Heatran, Adamant Lucario, and Dragonite that heavily threaten it. It also notably allows it to outspeed most defensive Latias and Taunt while it uses Recover. As Gallade is very weak to status, a Lum Berry helps it stave off common status-inducing moves such as Jirachi's Body Slam and Choice Scarf Breloom's Spore. Some other options include using a Custap Berry to surprise faster threats with Destiny Bond, Focus Sash to survive any one attack, Leftovers to help mitigate residual damage, and Life Orb to really power up Gallade's attacks, but the latter is often better with additional coverage moves.
Gallade can also invest in its bulk to take advantage of its Special Defense stat. Notably, Gallade survives Modest Choice Specs Latias's Draco Meteor and can still outspeed up to Adamant Lucario with an EV spread of 148 HP / 124 SpD / 236 Spe with a Jolly nature. Notably, Gallade doesn't need Attack EVs to threaten targets such as Clefable and the bulk lets it live attacks such as Roserade's Leaf Storm and Zapdos's Thunderbolt. Beware that such a spread makes it harder to punch through neutral targets with Close Combat while the stat drops from Close Combat make it harder to survive attacks.
Usage Tips
Gallade generally should lead with Will-O-Wisp unless the opposing lead is likely to have a Focus Sash or Lum Berry. Foes such as Tyranitar often will switch out to a Fighting-resist such as Rotom-A, Zapdos, or Latias and get burned in the process. However, leads such as Metagross, Gyarados, and Azelf are difficult to account for, as all are bulky enough to survive Gallade's attacks and can KO or set up on it. It's often best to just switch against these leads, as it is very possible to lose Gallade for nothing. However, do not be afraid to freely sacrifice Gallade if it has accomplished its job, as it is meant to get momentum early. Additionally, leads such as Heatran and Empoleon, while heavily threatened by Gallade, might have a Focus Sash and just KO Gallade back after it has reduced its defensive stats. Gallade should also leverage the threat of good coverage to burn targets; Gallade's huge movepool often makes opponents less likely to send in answers that Gallade could have the coverage move for, most notably frail Ghost- and Psychic types that are threatened by Shadow Sneak should as Gengar, Rotom-A, and Starmie. Taunt is often unexpected from Gallade and can be effective in preventing entry hazards and set up, but beware of Gallade's frailty.
Team Options
Gallade makes for a great choice on hyper offensive teams trying to get early momentum and potentially burn bulky Pokemon. Its main competition for this role are Breloom and Machamp, as Breloom can sleep the foe and hits very hard while Machamp's confusion from Dynamic Punch can potential push past bulkier Pokemon such as Skarmory and Hippowdon. Gallade is generally more effective against defensive teams due to more permanently disabling walls with a burn. This prowess is highly useful for teammates such as Dragon Dance Gyarados, Calm Mind Jirachi, and Agility Metagross. Gyarados really enjoys walls being burned, as the residual damage puts Skarmory in 2HKO range for +1 Waterfall, while defensive Zapdos and Latias are permanently weakened by burn damage combined with +1 Ice Fang and Stealth Rock. Calm Mind Jirachi also enjoys a weakened Latias and a burned Jirachi, as they can no longer check its offensive Calm Mind set. As Gallade cannot set up Stealth Rock, synergetic partners such as Metagross, Camerupt, Swampert, Empoleon, and Heatran can help take on problem match ups for Gallade, such as against Azelf and potentially Metagross. Gallade's access to Taunt and decent Speed makes it a serviceable lead for partners who are weak to Stealth Rock, such as Gyarados, Dragonite, and offensive Zapdos. Mixed Dragonite is an exceptional partner, as it can further threaten defensive teams once Gallade has initially weakened Dragonite's checks with burns and Close Combat. Other offensive partners such as Dragon Dance Tyranitar, Swords Dance + Pursuit Scizor, offensive Empoleon, and Lucario are also excellent partners.