Bulbasaur using what I assume is a very free adaptation of the Absorb move (?) for a cheap win on that Gastly.
If you hadn't had enough OP monsters that needed nerfing for one chapter, here comes Charmeleon displaying what I think is the most violent attack I've ever seen in all of Pokémon official media so far, slicing Arbok in half to give us a cross-sectional Pokémon anatomy class. May have beeen a critical hit Slash if I have to pick something from its movepool. We can tell that Blue is not an item hoarder and does use his TMs as his Charmeleon also knows Reflect.
Koga in the ninja uniform doing ninja things revealed as the mastermind behind the incidents. He probably didn't account for two 10-year-old kids to mess with his plans.