Aparently the strongest in Nasuverse is ORT but I havent read enough to know its full capacity. Anything stronger than it are welcomes into the battle as well but please link your combatant
Round 1: v.s Shiki Ryougi - stomp
Round 2: v.s. Edmond Dantes - Yukari wins (Veloxt1r0kore)
Round 3: v.s Kiara Sessyoin - Kiara wins (Paul_Frank), tie (Ciruno_Fortes)
Round 4: v.s Saver -
Round 5: v.s zashuuuu - get zashuuuued instead (Ciruno_Fortes, https://vsbattles.com/vsbattles/1002439?useskin=oasis also confirmed Yukari's superiority), inconclusive (Paul_Frank)
Round 6: v.s Kischur -
Potential combatant: Kama & Shiva (I will add them in once a canon/viable source is presented)
(wow train lady is powerful, I was about to put her against saber altoria, glad I made this post first lol)