Arena Trap: Prevents the opponent from switching. Does not work against Flying-type foes, and those with Levitate.
Sand Veil: Evasion is increased by 20% in a sandstorm.
Aerial Ace Earthquake Rock Slide Sucker Punch
252 Atk / 152 Spd / 104 Def
Diglett is a great asset to a team that has a particular weakness to one Pokemon that has the potential to do serious damage to your own team. Diglett's Arena Trap ensures the foe cannot switch out this dangerous foe, allowing you to attack it and get it down before it dominates your team later on. With a Choice Scarf and 104 Speed EVs, Diglett can outspeed a max Speed Scarf Gabite, as well as a max Speed Electabuzz and Kadabra, and use the appropriate attack to take them down, greatly helping a team later in the game where Kadabra sweepers are usually introduced. Diglett has a few other physical attacking options, including Shadow Claw, Pursuit, Slash and Body Slam, although the listed provide the best coverage in OU. Aerial Ace takes down Grovyle, who is outsped by this set, while Rock Slide and Earthquake give nearly unresisted coverage. Sucker Punch is your best option for faster Choice Scarf-users (anything faster than max Speed Sneasel will outspeed Diglett), and ensures Haunter is OHKO'ed, while aiding Diglett against slower priority attack-users that usually threaten a OHKO because of Diglett's very low HP and lacking Defense.
152 Speed with a Choice Scarf, as mentioned before, allows Diglett to outpace a Choice Scarf Gabite for a KO with Earthquake. Diglett always loses to a max Speed Sneasel with Ice Shard, where even Sucker Punch is not enough to take Sneasel down before it gets the chance to attack. The remaining EVs are delegated to Defense to aid Diglett in taking priority moves and weaker Rock attacks, although it should be noted that even these usually lead to a 2HKO.
Aerial Ace Earthquake Rock Slide Sucker Punch
252 Atk / 252 Spd / 4 Def
In exchange for not outspeeding Sneasel, Electabuzz, Scarf Gabite and Scarf Quilava, this set remedies Diglett's issue of becoming set-up fodder and an easy revenge kill that the previous set forces upon it. Diglett will likely not miss the Defense EVs, as even neutral priority attacks are usually enough to OHKO it, as well as Aqua Jet and Ice Shard in themselves being the most popularly-used. Common set-uppers such as Seadra, Croconaw, Bidoof and Misdreavus, who appreciate the locked-in Sucker Punch to allow them to set-up their appropriate attacks, become out of luck with this set, as Earthquake devastates all of them but Misdreavus, who is outsped and takes serious damage from Aerial Ace. This set is recommended if you have multiple set-uppers of your own, or a considerable number of bulkier Pokemon, as this set doesn't require that you switch to another Pokemon, who might not be able to take the stat-boosted opponent down without first setting up somehow, or plain not being able to do it without having the fortune of being able to deal heavy damage by exploiting weaknesses.
Diglett is an amazing Pokemon for any team who has a weakness to a particular Pokemon who doesn't have levitate, or isn't a Flying-type. Its ability to trap the foe, and attack it with the most powerful priority attack in the game, Sucker Punch, is something no other Pokemon can say. It's one of the best Kadabra counters in the game because of this, although it's sad that it doesn't get STAB for it. Any team who is weak to Voltorb, Magmar, Skiploom, Staryu, or the aforementioned Kadabra can greatly benefit from Diglett. It should be noted, however, that Diglett works more as a tool to take down one certain Pokemon, rather than sweep an entire team. Because of Choice Scarf, and Diglett's vulnerability to many priority attacks, it is susceptible to the foe's switch-in after the initial foe you take down is dealt with. Therefore, pairing Diglett with Pokemon that can handle most priority attacks is beneficial. Monferno makes a sound teammate, as it resists Ice Shard from Sneasel and Piloswine, and resists Sucker Punch. It can then proceed to hit Sneasel and Piloswine (the most common Ice Shard-users) with Mach Punch or Flamethrower, respectively, although its sub-par defenses are something to keep in mind. Monferno also has a resistance to Grass attacks for Diglett counters such as Grotle and Bayleef.
A Choiced Sucker Punch makes Diglett terrible set-up fodder, and Earthquake is resisted by Flying-types and most forms of Bronzor. After Diglett deals with its initial foe, it is wise to retreat it for later use, unless the foe can easily be taken down by one of Diglett's attacks, and the foe doesn't pack a priority move. Common exploiters of this are Gligar, Shelgon, Pupitar, Rhydon and Seadra. This makes Wartortle a good teammate, as it can hit Gligar, Pupitar and Rhydon for serious damage with Aqua Jet, and can hit Shelgon with Ice Beam. Tangela boasts enough Defense to be able to be 2HKO'ed by most boosted attacks from these Pokemon, and can hit Pupitar, Seadra and Rhydon with Energy Ball, while hitting Gligar with Hidden Power Ice. Tangela also has a resistance to Grass and Water attacks, which hinder Diglett, although both share a common Ice weakness.
Bayleef and Grotle have enough Defense to take any of Diglett's attacks other than Aerial Ace, and can counter with Energy Ball. Sneasel outspeeds Diglett, and can hit with Ice Shard, although Sucker Punch deals low-enough damage on the Choice Scarf set to be a non-issue. Bronzor with Levitate is resistant to Diglett's QuakeSlide, takes manageable damage from Sucker Punch, and can hit Diglett with Psychic, Gyro Ball or Grass Knot for an at most 2HKO. Piloswine takes little damage from anything but Stone Edge, and can hit Diglett with Ice Shard. Sneasel can easily switch in on a choiced Sucker Punch, and immediately threaten Diglett with Ice Shard, or use it as setup fodder for Swords Dance or Substitute.
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