If your Pokemon evolves later it could learn more attacks in its pre-evolved form that maybe could not learn if evolved (particularly true with Pokemon who evolve from stones) or it could skip some attacks that should learn in its evolved form. In this case, it is not important, because butterfree will learn Confusion at level 12.
In Red and Blue, it learns Confusion at Level 12, two Levels after it evolves from Metapod. In every other game, it learns Confusion at Level 10, as soon as it evolves from Metapod.
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Butterfree can't learn Aerial Ace by level up. It can, however, learn it by TM, which you can find on Route 9.
Metapod evolves into Butterfree at Level 10.
If your Pokemon evolves later it could learn more attacks in its pre-evolved form that maybe could not learn if evolved (particularly true with Pokemon who evolve from stones) or it could skip some attacks that should learn in its evolved form. In this case, it is not important, because butterfree will learn Confusion at level 12.
In Red and Blue, it learns Confusion at Level 12, two Levels after it evolves from Metapod. In every other game, it learns Confusion at Level 10, as soon as it evolves from Metapod.
Butterfree learns Confusion as it's first move. Lv. 10. If you for some reason do not have the movie in a Butterfree of higher lv. simply either breed a new Caterpie or visit the move re-learner in his house on Island Two for him to teach it the move again (costs either 1 Big Mushroom or 2 TinyMushrooms).
Kadabra learns confusion. *This occurs at LV16
Butterfree is in Pokemon Gold Version. Butterfree is pokemon number 13 on the pokedex. It can be obtained by training a Metapod to level 10, at which point it evoloves.
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level 47
Level 10
Butterfree can't learn Aerial Ace by level up. It can, however, learn it by TM, which you can find on Route 9.
Metapod evolves into Butterfree at Level 10.
At Level 10, the same as in blue, red, yellow and all the other games.
You have to use the TM to teach it Psychic.