To use Genesis Supernova, a Pokémon must know the move Psychic and hold a Mewnium-Z crystal.

According to Bulbapedia,

Mew, or a Pokémon transformed into Mew, can use Genesis Supernova if it knows Psychic, holds Mewnium Z, and if its Trainer wears a Z-Ring. Mew cannot use Genesis Supernova if it is transformed into a Pokémon other than Mew.

Meanwhile, Ditto is one of three Pokémon that can learn Transform (and it only knows Transform), but it is incompatible with Mewnium-Z and cannot learn Psychic.

If this is the case, how can Ditto use Genesis Supernova?

  • 4
    Because it's a Ditto.
    – Frank
    Jul 12 '17 at 4:06
  • 1
    @Frank ...really?
    – JTR
    Jul 12 '17 at 4:08

There is some confusion about whether Ditto can hold the Mewnium-Z (or any exclusive Z-crystal, for that matter). Counter to what the game makes it seem like, you are 100% able to give Pokémon Z-crystals that they are incompatible with. Under normal circumstances, this just wouldn't do anything. For instance, here is my entire party holding Mewnium-Z.

Although a bit counterintuitive, you are able to do this, even in the face of the "Incompatible" warning:

z crystals

cant use

holds crystal anyways

for posterity

Therefore, a Ditto holding Mewnium-Z can use Genesis Supernova if it is transformed into a Mew that knows Psychic. Similarly, Ditto (or any other Pokémon with the ability to Transform) can use an exclusive Z-move of any Pokémon it is transformed into, as long as it is holding the appropriate Z-Crystal and the Pokémon it transformed into knows the correct move.

I found a video of someone proving this by having their Ditto transform into a Tapu Fini while holding Tapunium-Z and use Guardian of Alola.

Therefore, for a transformed Pokémon to use Genesis Supernova, they'd just need to be holding a Mewnium-Z and transform into a Mew that knows Psychic.

  • 1
    Using a Z-crystal on a Pokémon causes it to hold that Z-crystal.
    – Wrigglenite
    Jul 12 '17 at 16:49
  • @Vemonus so, using this logic, if we make some pokemon that knows Mimic to holding incompatible Z-Crystal and make the pokemon mimicking the move that compatible with Z-Crystal, then we can perform the Z-Move?
    – JTR
    Jul 13 '17 at 1:25
  • @JTR no, the exclusive Z-moves all seem to indicate the user must also be the correct species, so only that specific Pokémon or a different Pokémon transformed into it can use that Z-move. I guess it's worth mentioning that technically, Mew could use transform and use exclusive Z-moves just like Ditto.
    – Vemonus
    Jul 13 '17 at 1:27
  • @Vemonus oh okay, and how about the normal Z-Crystal? Is it work?
    – JTR
    Jul 13 '17 at 1:28
  • 2
    @JTR the typed Z-crystals can be equipped by any Pokémon as well, but won't work unless that Pokémon knows a move of the specific type.
    – Vemonus
    Jul 13 '17 at 1:29

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