Ayyyy, Low 2-C Flowey is REAL!
Silver:
- Silver's Type 4 Acausality regarding being "decoupled from time" aids in his biggest issue; SAVE and LOAD. At the very least, Silver will remember any Resets performed and likely be able to adjust easily to it after the first one throws him for a loop (heh).
- Silver's reliance on Psychokinesis over being a physical fighter aids in holding off Flowey's relentless Danmaku and potentially allow for ragdolling Flowey himself, especially since Silver lacks the means to heal himself across a fight as Frisk often does.
- Superior Range via Super Warp Rings and Chronos Control allows for Silver some minor control of the battlefield. I say minor because Flowey can just Reset prior to whatever Silver pulls, negating it entirely.
Flowey:
- SAVE and LOAD allows Flowey free reign over the timeline, resetting himself/the battlefield to optimal conditions for himself, even if it doesn't work on Silver directly.
- His greater control over the timeline practically nullifies being targeted with Chronos Control
- Existence Erasure may be an issue if Flowey tries to use this offensively on Silver, a solid wincon here.
- Can break out of a potential scenario where Silver simply PK traps him akin to Sans' Turn-Locking, via SAVE and LOAD.
Overall, they seem to counter each other perfectly. Flowey's Danmaku is hard-countered by Silver's PK, which he will absolutely use solely for the fact that it's his only answer to bullet hell; Flowey being a large enough target that Silver will also target him directly, or have his attacks thrown back at him.
Flowey, however, renders Chronos Control utterly useless thanks to his position of holding the timeline at his mercy. Not only that, Flowey can also reset the circumstances of the fight when things spin too far out of his favor.
However, Archie Silver doesn't have nearly the Determination that Frisk
or even Game Sonic has; meaning he's not really in a position to cause Flowey enough problems to give up despite the HUUUUGE difference in Lifting Strength in Silver's favor. Overall, despite having a formidable repertoire with PK/LS Spam and Time-Centric Type 4 Acausality, Silver loses the battle of Determination.
Ultimately, I vote Omega Flowey mid-high diff.