The only LC Pokemon with higher base speed than Abra are Voltorb and Diglett. A lot of Pokemon have the same base speed though, so you could potentially win the speed tie. These are Ponyta, Meowth, Pikachu, and Poliwag.
Voltorb
Voltorb can't really do much. It has 100 base speed but that's all it has. It's attacking stats are terrible. Your best bet would be getting off a Thunder Wave or just plain Exploding.
Electrode
Maxed EVS
- Thunder Wave
- Thunderbolt
- Explosion
- Light Screen
Diglett
Diglett is probably your best bet. It outspeeds Abra and has decent Attack. Earthquake is spammable STAB, you'll be getting tons of crits with Slash, Rock Slide is coverage, and Substitute because it doesn't have anything else.
Diglett
Maxed EVS
- Earthquake
- Slash
- Rock Slide
- Substitute
Meowth
Meowth isn't guaranteed to outspeed, but it can win the speed tie and probably KO Abra with a critical STAB Slash. This thing's movepool is horrendous.
Meowth
Maxed EVs
- Slash
- Toxic
- Skull Bash
- Thunderbolt
Poliwag
Poliwag has the same base speed as Abra and it's special is pretty bad, but it gets access to the absolutely broken move that is Amnesia.
Poliwag
Maxed EVs
- Amnesia
- Hydro Pump
- Ice Beam
- Body Slam / Psychic
Ponyta and Pikachu
Simply put, don't use these two. They won't be able to do pretty much anything besides Pikachu perhaps Paralyzing it or Ponyta maybe scratching it with Double-Edge.
Pikachu
Maxed EVs
- Thunder Wave
- Thunderbolt
- Double-Edge
- Quick Attack / Submission
Ponyta
Maxed EVs
- Double-Edge
- Fire Blast
- Agility
- Swift