Some balls are, seemingly, not legal per the game but allowed by the editor.
The valid one below is a "bred" shiny with a Luxury Ball. The Illegal one is identical but uses a Love Ball. Both are considered legal by the editor, but the game finds issue with the Illegal one.
PKHeX new update legality errors (contribution page)
in PKHeX
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Some balls are, seemingly, not legal per the game but allowed by the editor.
The valid one below is a "bred" shiny with a Luxury Ball. The Illegal one is identical but uses a Love Ball. Both are considered legal by the editor, but the game finds issue with the Illegal one.
909 ★ - Fuecoco - 53890C76154F.pk9 ILLEGAL 909 ★ - Fuecoco - 53930C76154F.pk9