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I'm trying to decide between Gyarados, Umbreon, Vaporeon, or Hitmonchan for the final slot in my HeartGold team, and I'm leaning towards Hitmonchan but only if it will have Iron Fist when I evolve it.

Also I have looked it up online but couldn't find a satisfactory answer.

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Bulbapedia and Pokemon Database don't agree on which of Hitmonchan's abilities come first, so I can't answer this.

2 Answers

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Best answer

Possibly. In your version, Heartgold and Soulsilver (I'm assuming from the tags)...

...in Generations IV and V, when a Pokémon evolves, its personality value is rechecked and the Pokémon's Ability may change.

The previous answer was only partially correct, though. It is luck of the draw, but it is pre-determined. You can't save and reset before evolving it to try for a different ability. Pokemon's abilities are determined by personality value, which, as I said, is pre-determined. I'm not going to go into it, but if you want a different ability on your Tyrogue or Hitmonchan, you'd have to breed for it.

More info on personality value's affect on abilities found here.
Good luck.

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It was Keen Eye :( But thanks to you both.
That is very good to know. I was always under the intention that when a Pokémon evolves, it has a 50/50 chance for either ability...you learn something new every day in the Pokemon world. And you are welcome, Spook.
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Tyrogue evolves in a unique way at level 20. It all depends on the attack/defense stats.

Tyrogue will evolve into Hitmonchan if his attack is lower than his defense.

Hitmonlee: attack > defense
Hitmontop: attack = defense

As for the ability, I would recommend saving the game before he gets to level 20. I am 99.9% sure the ability is luck of the draw (like Natures). Iron Fist is by far the best ability for Hitmonchan.

Also, try to get a Nature that increases the attack stat. Adamant, preferably.