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Base 140 Attack Base 112 Special Attack Base 110 Speed
It's to balance him out.
And it's not as bad of an ability as, say, Truant or Slow Start.
Still, you probably will only focus on one of the attack stats at once, so the other one is wasted.
Alakazam with Magic Guard+LIfe Orb is faster and stronger, and being able to use Life Orb safely does give a lot of other pokemon the edge. Even weaker/slower pokemon can use Choice Band/Specs/Scarf to hit and run. Archeops can't really do that in competitive battles because it takes too much damage from Stealth Rock.
It's a good pokemon but if it had a normal ability it would probably still not be Uber.