Abra represents my favourite attacking style: the Special Glass Cannon. I really like it, so here's a moveset.
Abra @ Spooky Plate / Pixie Plate / Silk Scarf
Ability: Magic Guard
EVs: 252 SpA / 252 Spe / 4 SpD
Modest / Timid Nature
- Psychic
- Energy Ball
- Shadow Ball
- Tri Attack / Dazzling Gleam
First, I picked Magic Guard as its Ability because one, a single Toxic could spell the end, and two, Inner Focus and Synchronize simply aren't useful on such a fragile Pokemon. Modest and Timid natures both lower Attack, and raise Special Attack and Speed respectively. Both are useful to Abra, while Attack is completely useless. The EV spread boosts Special Attack and Speed, Abra's most important stats. Ordinarily, I would invest the others in HP, but Abra's HP is so bad that it simply wouldn't be worthwhile to boost. Instead, Abra has decent Special Defense, so it would be the next best thing. As for the moves, Psychic is Abra's best STAB move. Shadow Ball is excellent Ghost coverage. Energy Ball is an all-around good move that can lower special defense. Tri Attack and Dazzling Gleam are both solid moves, Tri Attack has a better secondary effect, but Dazzling Gleam provides Dragon and Dark coverage. Take your pick. As for the items, the Spooky Plate boosts one coverage move, and the Silk Scarf or Pixie Plate will give coverage for the other 80 base power one. Energy Ball doesn't need a boost, since it has 90 base power and the others have 80.