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Leaker 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