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The masters 8 are: Leon, Ash, Cynthia, Alain, Diantha, Iris, Lance and Steven.
Ash's PWC opponents are Alain, Cynthia and Leon, in this order.
The only reserve Ash uses is Greninja vs Alain. Ash-Greninja returns for that fight. Animation is still bad. It literally only happens for fan closure and is not a very good battle. No IKU ZE.
The M8 battles aren't a straight arc. There's some filler between each.
Everyone who's returned so far will return again in-between M8 battles.
For Serenafags her next return also involves Clemont and Bonnie. It ends with a scene with her and Ash alone pretty close and in silence before the camera pans up to the sky. No kiss though.
Goh friends and befriends Mew, but doesn't capture it. Gary nods with approval.
Ash beats Leon. Pikachu delivers the final blow.
It's the series's end. The TRio eventually leaves the organization and makes peace with Ash and go run their radio again. There's a large celebration where everyone shows up.
Ash declares he'll still be pursuing the dream of "Pokemon master" but that people misunderstood it. Pokemon Master is not a specific goal. It is a lifelong journey.