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Have you noticed? Every pokémon with a mega evolution has 1 extra image for each mega evolution, along with those with alternate forms (Kyurem, Keldeo, 18 vivillon's lines, etc)
>Charizard has 2
>Garchomp/Mewtwo/Lucario has 1
and so on
Mothim has 2 extra images.
It is the only one following this pattern, but it doesn't have alternate forms nor megaevolutions yet
WHY?