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Schizophrenic fanfic writer here. Semifinals are 6v6 and 2 gimmicks are allowed. Ash will use his old pokemon against Cynthia: Infernape, Sceptile, Krookodile, Lycanroc (z-move), Greninja (no A-G) and Mega Charizard Y (this will be a surprise during the battle: they will show a flashback where Ash and Alain talk after Alain loses and he gives Ash the mega stone)
Cynthia's team is Garchomp (mega), Kommo-o (z-move), Lucario (shiny), Togekiss, Porygon-Z (finally), Giratina.
Ash will win and Leon will be so proud of him, he disowns Hop and declares to the stadium that Ash is his new brother. The next series focuses on Hop on a revenge arc to redeem his position as the Charizard master's brother.