Skyward Pride is the closest fit on the game's own numbers: Freminet's kit multiplies ATK, and a weapon is ranked here on whether its ascension stat and its passive act on that stat. The Unforged, "Ultimate Overlord's Mega Magic Sword" and Wolf's Gravestone come next. No playtested ranking has been imported for Freminet, so this is arithmetic over the kit data rather than a damage measurement.
Run Finale of the Deep Galleries on Freminet, with Blizzard Strayer and Celestial Gift behind it. Main stats are ATK% sands, ATK% goblet, ATK% circlet. Roll substats in the order Energy Recharge > ATK% > CRIT Rate > CRIT DMG.
Talent priority is Elemental Burst > Elemental Skill > Normal Attack. The Elemental Burst costs 60 energy, which is what an Energy Recharge target has to clear.
The strongest team is Freminet, Xingqiu, Fischl and Mika, built around Freminet: Cryo · Freeze.