Genaller
Silver Soul
Fairly straightforward question. By “Base” I mean when not factoring in Incineroar’s Z-move. Note that “Upper E4 Ace lvl” means on the lvl of Pokémon like Flint’s Infernape it Caitlin’s Gothitelle while “Lower E4 Ace lvl” means on the lvl of Pokémon like Lucian’s Bronzong or Wikstrom’s Scizor. For me based on what we know so far I’m going with Upper E4 Ace lvl though it should be worth noting that in-game Kukui is treated as the equivalent of a champion.