Moves
Psychic is a strong STAB attack that lets Abra hit the large number of Fighting- and Poison-types in the tier. Dazzling Gleam hits Dark-types for super effective damage, letting Abra revenge kill Vullaby and Scraggy. Hidden Power Fighting or Fire gives Abra a way to hit annoying Steel-types like Magnemite, Pawniard and Ferroseed. Alternatively, Counter can be used to bait in physical attackers, primarily Pursuit trappers, and retaliate if Abra has retained its Focus Sash. Abra's final slot is a decision between Protect, Energy Ball, and Psychic Terrain. Protect allows Abra to scout against Choice Scarf users and get around Fake Out. Energy Ball lets Abra 2HKO Slowpoke and Mudbray, OHKO Shellder, and more reliably revenge kill bulky Shell Smashers. Psychic Terrain lets Abra get around priority and potentially pull off a late game sweep.
Set Details
Abra's EV spread is very straightforward. 200 Speed EVs with a Timid nature let Abra hit 19 Speed, which lets it outspeed the unboosted tier except for Diglett, Elekid, and Voltorb, and 240 Special Attack EVs let Abra hit as hard as possible. The combination of Focus Sash and Magic Guard means Abra can act as a one-time stop to set-up sweepers lacking multi-hit moves, because Magic Guard ignores entry hazard damage that would otherwise break Abra's Focus Sash.
Usage Tips
Abra is an amazing revenge killer, as it possesses good coverage, blazing Speed, and a sky-high Special Attack, but it has horrendous defenses. Thus, Abra should not be switched directly into play, but rather through U-turn or Volt Switch or after a KO. Furthermore, Abra is very susceptible to trappers such as Diglett and Alolan Grimer, the latter of which can switch in on it. For this reason, if there are trappers on the opposing team paired with a sweeper, it's best to not put Abra into play until the opposing sweeper has set up. Versus teams that lack trapping, Abra does not need to be played conservatively and can freely pressure the opposing team. Lastly, Abra should not be sent out versus Pokemon with priority unless necessary, because otherwise it will lose its Focus Sash.
In most situations, Abra will be using Psychic or a super effective coverage move, but Knock Off can be used on predicted switches to walls like Munchlax and Bronzor. Keep in mind that Knock Off is a very high-risk move, though, and if Abra uses Knock Off in any other situations, it will likely be losing its Focus Sash. Note that while Psychic does more damage to Fighting-types, Dazzling Gleam is a good move to use if the Fighting-type Abra is facing is at medium-to-low HP and you're unsure whether or not the opponent will send in a Dark-type.
Team Options
Because Abra cannot switch into play, Pokemon like Magnemite, Chinchou, and Mienfoo pair nicely with it. These Pokemon provide VoltTurn support for Abra so it can get into play without wasting its Focus Sash. Checks to priority users such as Pawniard, Corphish, and Timburr are appreciated for the same reason. Fighting-types like Mienfoo and Timburr cover Pawniard, Foongus and Spritzee cover Timburr, and Foongus and Chinchou cover Corphish for Abra. To mitigate Abra's tendency to be Pursuit trapped by Alolan Grimer, Diglett can also be run as a partner to countertrap it.
