Technician really increases the variety of this Pokemon. It allows it to have a decent strength STAB move (90 base power STAB Ancientpower). However, even with this boost to its main STAB attack, it still isn't anything overly powerful or broken. As a comparison, on average Gengar's Shadow Ball is stronger than CAP5's Ancientpower if both Pokemon have the same natures and hold item.
The 10% chance of Ancientpower's secondary effect happening is so pathetically small that it will very rarely occur in the 8PP Max that Ancientpower has. And even if it does, there is still absolutely nothing this pokemon will be able to do to get past Blissey (bar perhaps Explosion or Head Smash, which don't count because CAP5 dies as well, and will not necessarily find their way into its movepool). If you are not convinced, then take a look at the following:
Timid CAP5 +1SpA w Life Orb & Technician Ancientpower vs Calm 0/176 Blissey -25% - 29%
I can't see it being broken when Blissey puts such a full stop on it's attacks.
One more thing to note about Ancientpower: since Ancientpower is effectively useless on everything else, it will become the trademark attack of this Pokemon, much like Tri Attack on Porygon-Z or Aerial Ace on Scyther or Bullet Punch on Scizor. Not only does this add a lot flavour-wise, but it also brings a competitively unseen move to light.
An even more enticing thing about Technician is the amazing variety of attacks CAP5 will be able to run. It allows it to run a set of Special attacks very effectively - the Hidden Powers. It can run any HP with a power of 60 and have it turn into a base 90 special attack.
This means plenty of very new and original attacks such as HP Fight 60 being just as strong as Aura Sphere, and being able to use attacking types it might not be able to otherwise (such as Bug, Flying, Grass, Water, etc.)
Also, we could have CAP5 use other competitively unseen moves such as Dragonbreath, Giga Drain, Icy Wind, Mud Shot, Ominous Wind, Silver Wind, Swift, Water Pulse, etc, and have CAP5 use these moves as if it had STAB on them.
All in all, Technician expands the horizons for this pokemon in so many ways - completely breaking the mold by having a powerful, varied and effective special sweeper.
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