From my experience, you cannot find or buy the move Giga Drain In Pokemon Emerald. It is only a learned move. If you have a Shroomish, it will learn Giga Drain in one of its advanced stages.
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buy them
No, you can't.
you cant get a timer ball in emerald
You buy them in the Pokemon markets.
No, Aerial Ace is not a purchasable TM in Pokemon Emerald. You can obtain it by defeating Winona.