You can either wait until he is like level 50 or 51 and he tries to learn it himself, or teach him the TM, and i don't know where energy ball is, sorry.
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Some moves Treecko can learn by leveling up are energy ball, quick attack, agility, and detect. Treecko can also learn giga drain, and pursuit.
Treecko weighs 11 pounds and can learn many moves including energy ball, mega drain, and absorb. Treecko can also learn solar beam, and grass knot.
no
I think that TM energy ball doesn't exist in heartgold. You can find it in Pokemon diamond and pearl on ds.
Yes, you can.