Other known variants
x2
Shadow StitchingUntil the end of your opponent's next turn, each Pokémon your opponent has in play, in his or her hand, and in his or her discard pile has no Abilities. (This includes cards that come into play on that turn.)
Moonlight SlashYou may return a Energy from this Pokémon to your hand. If you do, this attack does 20 more damage.
If Magearna EX with the "Mystic Heart" Ability is in play, are all Pokemon with Metal Energy attached protected from Greninja's "Shadow Stitching" attack?
If Magearna EX has a Metal Energy attached to it, all Pokemon with Metal Energy attached are protected; however, if Magearna EX does not have a Metal Energy attached to it, its Mystic Heart Ability is shut off and no Pokemon with Metal Energy attached are protected.
If Bronzong with the "Metal Fortress" Ability is in play, are benched Pokemon protected from Greninja's "Shadow Stitching" attack? If so, does it also protect Pokemon that come into play on the bench during the opponent's turn?
If Bronzong is on the Bench, all benched Pokemon are protected, including ones put into play after the attack has happened (for example, Shaymin-EX's "Set Up" Ability will work in this scenario); however, the Active Pokemon is not protected, even if it goes to the Bench it will not get its Ability back. If Bronzong is Active and has its Metal Fortress shut off, the Benched Pokemon are not protected; even if it moves to the Bench, it will not get its Ability back. Finally, if Bronzong is on the Bench and becomes the Active Pokemon during your turn, it loses its Ability and the Benched Pokémon are no longer protected.
If Marowak's "Bodyguard" ability is in effect, preventing the effects of attacks on me and my hand, does Greninja's "Shadow Stitching" attack turn off abilities of Pokemon in my hand or not?
Shadow Stitching turns off the Bodyguard ability, so until the end of your next turn none of your Pokemon will have Abilities.
If I have Suicune with the "Wind Charm" Ability Active and my opponent attacks with Greninja's "Shadow Stitching", are all my Abilities turned off including "Wind Charm", or does "Wind Charm" prevent "Shadow Stitching" from disabling my Pokemon's Abilities?
Wind Charm prevents Shadow Stitching from disabling your Pokemon's Abilities. However, if Suicune goes to the Bench, Wind Charm's effect goes away and your Pokemon will no longer have Abilities that turn. Suicune also does not protect any Pokemon not already in play.