The smallest thing that I can shoot comfortably is the Glock 43.
Don't know if that qualifies as "pocket" in the OP's case since the term is somewhat subjective. The G43 offers 9mm performance, outstanding reliability, good sights in a slim, single stack 9mm frame. It's bigger than the LCP, but like many others here, I just can't shoot that little thing effectively.
In any analysis of "what gun for me?" The combination of shooter, weapon, and caliber is what makes that gun (and so, recommendation) effective or appropriate.
Typical firearm recommendation discussions center on the biggest caliber that the shooter can still shoot effectively. This time, it's more a matter of the smallest frame that the shooter can shoot effectively.
For me, the most concealable gun that I can shoot (big hands, like others) is the G43. I like the J-frame, and can shoot it reasonably well, but the cylinder adds a bit of bulk and I prefer the single stack 9.
My advice, since it matters only what you, the OP, can shoot well, is to try some of these firearms on the range. It may feel great in your hand, only to be unmanageable in recoil or operation. My local range will let you rent a gun for $17. But, they let you swap it out for as many different models as you like under that rental. So, for example, one day, I rented a S&W M&P Shield 9mm, a Glock 43, and a Walter CCP. All for the same fee.
Money well spent.