While Genesect's bizarre appearance might lead one to doubt its offensive prowess, one look at its movepool and base stats should tell you what a big mistake this is. Its high base 120 Special Attack and Attack stats, coupled with access to Download and a plethora of powerful offensive options such as Flamethrower, Ice Beam, Thunderbolt, Bug Buzz, and U-turn, make it a fearsome offensive threat that can run a variety of sets, ranging from Choice Scarf to even Rock Polish. Genesect's Bug / Steel typing gives it a whopping nine resistances and one immunity to go with its decent 71 / 95 / 95 defenses, meaning it gets many opportunities to switch in and wreak havoc. Unfortunately, Game Freak gave Genesect a rage-inducing base 99 Speed, leaving it narrowly outsped by common threats such as Garchomp, Manaphy, and Jirachi. Genesect is also vulnerable to all forms of entry hazards save for Toxic Spikes, and a 4x weakness to Fire-type attacks doesn't help either. Don't let these flaws deter you from using Genesect, however, as this powerful mecha bug can be a great asset to almost any team.
While Genesect falls agonizingly short of the magic base 100 Speed tier, it can still put a Choice Scarf set to great use with its base 99 Speed, outspeeding threats such as Dragonite, Haxorus, and Gyarados after a Dragon Dance. What makes this set so dangerous is Genesect's access to Download, a slew of coverage moves, and STAB U-turn, making it hard to counter. Thanks to its numerous resistances, Genesect can repeatedly switch in safely, obtain a Download boost, and scout the opponent's move with U-turn or fire off a powerful attack. Unlike Scizor, Genesect can deal heavy damage to bulky threats such as Skarmory and Jellicent which are common switch-ins to U-turn, while still outspeeding a major portion of the metagame. Once faster checks have been eliminated, Genesect can also sweep a weakened team late-game if it obtains a Special Attack boost.
U-turn is the crux of this set, making Genesect a powerful momentum grabber that can break down walls with ease; with STAB and an Attack boost from Download, it can deal heavy damage to a wide range of threats, even those that resist it. It also eases prediction early-game, as Genesect can hit the switch-in hard and go to a counter. Ice Beam takes out Dragon-type threats such as Dragonite and Garchomp, while Flamethrower roasts Steel-types such as Skarmory looking to sponge U-turn. Finally, Thunderbolt takes out Water-types such as Keldeo and Jellicent which can take Genesect's other moves, gets a hard hit on Chandelure, and gives Genesect BoltBeam coverage. However, Bug Buzz can be used over either of Thunderbolt or Flamethrower for a strong special STAB with which to clean up late-game.Team Options & Additional Comments >>>
Genesect can also run a very dangerous Rock Polish set, sweeping late-game once its counters have been weakened. It sits at a frightening 606 Speed after a Rock Polish, outspeeding even Jolly Excadrill in the sand; this ensures that fast Choice Scarf users such as Terrakion and Latios will not be able to rain on Genesect's parade. Obtaining a Rock Polish boost is not too difficult, either, when you consider the number of switches which Genesect forces; it can easily switch into a physical wall such as Skarmory, snag a Special Attack boost thanks to Download, and set up Rock Polish as the opponent switches. As an added plus, Genesect resists priority moves such as Ice Shard and ExtremeSpeed, and even Mach Punch from the likes of Breloom and Conkeldurr will not OHKO it.
Once again, Flamethrower, Ice Beam, and Thunderbolt are Genesect's primary attacking options, covering a wide range of common threats in the metagame and giving it perfect neutral coverage. However, Bug Buzz can be used over Thunderbolt in the last moveslot as Genesect loves having a powerful STAB option to sweep weakened teams with.Team Options & Additional Comments >>>
This set capitalizes on Genesect's excellent coverage and access to Download to function as a powerful mid-game attacker, tearing gaping holes in the opponent's team. The ability to switch moves eases prediction immensely, as Genesect can simply fire off powerful attacks and U-turn to a teammate when met with a counter, wearing down the opponent's defensive core for a teammate to muscle through and sweep later. Walls such as Ferrothorn, Jellicent, and Skarmory are all destroyed by the appropriate move, and even Blissey takes upwards of 50% damage from +1 U-turn. Though Genesect is narrowly outsped by Garchomp and the numerous threats with base 100 Speed, it can still get past these checks with U-turn and some prediction, dealing heavy damage to them as they switch in and going to a teammate that can take them out. Unlike the other sets, Genesect can freely run all three of Flamethrower, Ice Beam, and Thunderbolt while still having room for U-turn in the last moveslot, the reason being that it can freely switch attacks; it no longer needs a strong STAB option as it doesn't function as a late-game cleaner.Team Options & Additional Comments >>>
With Genesect's enormous movepool, it should hardly come as a surprise that it has a large number of other options to consider. A Choice Specs set can dish out heavy damage, particularly with a Special Attack boost from Download, but it is walled easily and forced out by faster threats such as Latios and Thundurus. Hidden Power Ground is usable on any set to net a surprise KO on common Heatran switch-ins, but it does little else. Explosion might seem like a good option on the All-Out Attacker set to deal heavy damage to Blissey, but its nerf makes it a bad option, and U-turn already hurts the pink blob significantly. Quick Attack is Genesect's only form of priority and can be used as a last-ditch attempt to finish off a weakened, faster opponent. Genesect also has access to special attacks such as Shadow Ball, Tri Attack, Signal Beam, Psychic, and Energy Ball, but they provide redundant coverage with the moves listed on the above sets. Techno Blast is Genesect's signature move, but if you think it is viable and wish to run it along with a Douse Drive, then a visit to the psychiatrist is certainly in order; Water-type Techno Blast is weaker than by Life Orb-boosted Hidden Power Water. Focus Sash can be used on the All-Out Attacker set to nab a surprise KO on a faster opponent, but the prevalence of entry hazards makes this a bad idea.
Genesect has several other boosting moves up its sleeve, but these are mostly unusable: Flame Charge is completely outclassed by Rock Polish, Charge Beam is weak and unreliable, while running a physical or even a mixed Hone Claws set is a sheer waste of Genesect's special attacking prowess. Finally, Genesect has access to Thunder Wave to cripple fast threats as they switch in, but it is better off just attacking.
Checks and Counters
With Genesect's fantastic coverage and access to U-turn, keeping it in check rather than trying to flat-out counter it will generally yield better results. Choice Scarf Chandelure can trap and eliminate non-Choice sets, but it must be careful while switching in as it will take heavy damage from a +1 Thunderbolt. Quite a few special tanks can also take all of Genesect's attacks with ease and force it out. Chansey, and to a lesser extent Blissey, comes to mind immediately, as it can sponge pretty much any special attack with its titanic special bulk while still soaking up a +1 U-turn comfortably; in return, it can cripple Genesect with Thunder Wave or wear it down with Seismic Toss. Specially defensive Heatran, while it is destroyed by Hidden Power Ground, isn't OHKOed by even a +1 Life Orb-boosted Thunderbolt, and can incinerate Genesect with its STAB Fire-type attacks. Tyranitar takes heavy damage from U-turn, but it can sponge all of Genesect's other attacks and destroy it with Fire Blast.
Exploiting Genesect's base 99 Speed is another great way of checking it. While it does have decent defensive stats, Genesect will still fold up to any powerful neutral STAB attack after some residual damage, and it is also vulnerable to both Stealth Rock and Spikes. Having entry hazards on the field will thus put the mecha bug between a rock and a hard place, especially if you also pack a fast, powerful Choice Scarf user such as Terrakion or Hidden Power Fire Latios to force Genesect out. Offensive Deoxys-S can revenge kill Genesect as well, as it outspeeds even the Choice Scarf set and OHKOes with Fire Punch or Hidden Power Fire. Lastly, Choice Scarf Magnezone with Hidden Power Fire works in a similar manner to Chandelure, but Choice Scarf Genesect can still outspeed and OHKO with Flamethrower.