Marco Shark said:
Wait, which reasons? I don't know if Ditto keeping its HP post-Transformation is something we accept here, & may just be game mechanics, & not a reason we can use here.
And Metal Powder & Quick Powder don't actually help Ditto after it Transforms. In-character, Transforming is usually the 1st thing Ditto does, & OP said it has time to do so in this matchup, so it's almost guaranteed to do so.
The only real edges I can think of might be:
A. If Ditto somehow gets to attack first, but it's only given time to Transform, as the OP specified. They didn't say it's given an opportunity for a free attack, so odds are, after it Transforms -which it'll do first thing, being in-character- combatants will probably become aware of each other, & aware Sans would likely just teleport to evade Ditto-Sans's attack.
B. Ditto's Stamina, if we interpret Dittos "At least Superhuman" as higher than San's "Very High".
C. Ditto somehow choosing an attack that one-shots Sans. However, I'm unsure if he's considered a 1-Shot-Wonder here, & Sans probably knows his techniques better. Gravity Manipulation? Teleport out or use own Gravity Manipulation to neutralize it? Gaster Blasters or Soul Bones? Teleport or Dodge?
Note that C. operates on the assumption that willing to kill Sans isn't like he is in the only time he's fought: His Genocide Battle, where he says he wonders why others don't use their strongest attacks first, & does far less goofing around.
Rather, for C. to work, Ditto has to not only use an attack, but if Ditto copies Sans's durability & such, it may be possible that if such an attack one-shots Sans, it does the same to Ditto-Sans. Other than concerns over the accuracy of GM vs Soul Bones/Gaster Blaster, I don't see why Sans wouldn't use his most deadly attacks first, while Ditto would suffer opportunity costs while it learns what the new form can do.
