I do believe that Time Stop and No Time/Space Without Time are two different things. For example, in 06, Silver has used Chaos Emeralds before to go to the past, but when he fought Shadow, Shadow used Chaos Control to stop time, which paused the world including Silver as well.
He slowed time, he didn't stop it.
Unfortunately we have never seen Cyn fight non-solver opponents besides planning a massacre on Earth and the Lab in Church. Her abilities are mostly telekinesis (more like XYZ Axis) based so she would either start with Null (instant kill), Scale (instant crush), Rotate (instant snap) or Move/Translate (rips you apart via selected part of your body or stops you from moving). Hence why she has one-shot skills. She only starts throwing hands if her opponent is another solver.
Null is the dura neg one, right? Crushing and snapping and ripping apart all seem to require LS and AP. Both of which she is weaker in. Which leaves only one as viable.
If the argument is she starts with creating holograms and hiding away, I stand by Metal Sonic using spin dash to blitz and attack all the holograms, and when he sees it's not workinng, slamming into the ground and doing a massive aoe nuke and getting Cyn as collateral. He'll be moving too fast for Cyn to react, and even if she had the time to react, there's no precedent for her being able to hit someone way too fast for her to even spawn her attack on.
That said, this Metal Sonic
does have a more limited copy ability; "Copycat". This lets him copy stuff from his rivals in Rivals 2. There's just a lot more limited movepool. He can copy stuff like Chaos Control and Silver's PK tho. That would let him copy TK or Time Manip (and prolly stuff like Teleportation) off of Cyn (I think the catch is it's a one time use IIRC).
Also after looking into it, Metal Sonic can copy Espio's invisibility by scanning him, even if he's invisible IIRC. So he actually should be capable of seeing through invisibility with his scanners (Which I suspected given so many other characters in the series already have enhanced senses and can tell where people are despite not being able to see them like Shadow, Sonic, Rouge, etc.) Don't see anything for illusions yet, but frankly with Eggman using them pretty often and the existence for Infinite, I wouldn't be surprised if I could find smth entailing he can see through them with his scanners so I'll look for that too. I will say if he copies TK, he can TK everything within hundreds of meters up to kilometers of himself. So that would also become another method of getting her.