The moves Butterfree learns in HeartGold are Confusion at Level 10, Poisonpowder, Stun Spore and Sleep Powder at Level 12, Gust at Level 16, Supersonic at Level 18, Whirlwind at Level 22, Psybeam at Level 24, Silver Wind at Level 28, Tailwind at Level 30, Safeguard at Level 34, Captivate at Level 36 and Bug Buzz at Level 40.
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Butterfree learns confusion at level 12.
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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.
You have to use the TM to teach it Psychic.
No, Butterfree cannot learn Fly.