PokéBase - Pokémon Q&A
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Best answer

Poison Jab.

Big, resounding Poison Jab. Here's why:

  • Better Accuracy - Always important.
  • Good Coverage.
  • Counter to Fairy-types, which Mewtwo X is weak against.
  • Chance to poison - 30%!!

Some calcs:

>252 Atk Mega Mewtwo X Iron Tail vs. 104 HP / 0 Def Xerneas: 306-360 (73 - 85.9%) -- guaranteed 2HKO

>252 Atk Mega Mewtwo X Poison Jab vs. 104 HP / 0 Def Xerneas: 244-288 (58.2 - 68.7%) -- guaranteed 2HKO

So you see, both are guaranteed 2HKO, so the Accuracy of Poison is more useful than the slightly higher power Iron Tail has to offer. (Although, if a Xerneas comes to play, you *must change Mewtwo X, because Xerneas can OHKO Mewtwo with a single Moon Blast).

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Mega Mewtwo X is a fighting type so you have to think if you want it to have a probability of poisoning the opponent or lowering the defense
poison jab has 100% accuracy but 80 power
iron tail has 75% accuracy yet 100 power
in my opinion I would go for the poison jab because I care more about the accuracy than the power