Technician is by no means a bad ability on Cinccino, and Skill Link does not directly outclass Techinician. Techinican gives CInccino the ability to use Wake-up Slap competently, which is the strongest move Cinccino gets against Steel-types. Techinican also allows Cinccino to hit even harder than Skill Link if Cinccino decides to hit 4 or 5 times.
If Cinccino hits 4 or 5 times, which is only a total 1/3 chance, then it will hit with 150 BP for four hits or 187.5 BP for five hits. On average, the weakness of 2-3 hit attacks make Technician the inferior option, but that doesn't mean that the high-variance strategy of Technician is not worth using. Technician 5-hit attacks are the strongest option that Cinccino has, and it's the only fighting chance that Cinccino has against bulky opponents such as Blastoise. Against bulky opponents, Technician is the superior option because Skill Link just ain't going to do enough damage. Though with Technician Cinccino is probably going to do even less damage, there's that 1/6 chance that Cinccino lights up the opponent with a 187.5 Base Power Tail Slap/Bullet Seed/Rock Blast.
Skill Link brings consistent power to Cinccino's attacks, while Technician gives Cinccino Wake-Up Slap and the potential to nuke the opponent with a 4-5 hit move. Both are viable, but since Cinccino can rarely afford hitting for only 75 Base Power, Skill Link is usually the better option.
Cinccino would be so broken in Pokemon Mystery Dungeon