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So in the picture, Lillie is playing with Pokémon like nothing, but in the present day, she's frightened of them.
If you asked a bunch of psychologists about this, the majority of them would say that Lillie was either a victim of a traumatic event or that she witnessed a traumatic event, and the fact that they showed Lusamine means the anime DOES have plans on showcasing the Ultra Beast arc (unless it's some weird movie thing).
All you people saying "hurr durr muh arora so fun desu xD" are going to wake up real quick when the latter goes full GX and brings the darkest arc to Pokémon to date.
