If I could pick a legend, it would be Giratina.... But, seeing as I can't, I'd choose Zorua/Zoroark or one of the Eeveeluthions. (Preferably Jolteon, Espeon or Umbreon)
If I could choose Giratina, It would be because of is awesomeness and it can also go to the Distortion world.
Zzorua/Zoroark, because they could transform into a zombie and destroy them from the inside, out.
Eeveelutions are just a personal favourite.
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