Masaaki Iwane posted this animation on Twitter

[Rath]

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View: https://twitter.com/animator1965/status/877672697425047552

Spoiler

It shows Ash, Lillie, and Guzma face to face with Mother Beast Lusamine[.spoiler]

 

[Shoutmon]

Nice but is just a fan animation. He already said he doesn't know what happens in the anime besides what he animates.

 

[Lillie]

Yeah it's been confirmed that it's just fan animation that he made and doesn't know if this exact scene will happen in the anime.

Closing.