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No. It can't learn Mega Drain but it can learn Giga Drain.
100
lv 51
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.
You'll need to level these Pokemon to a certain level to get Giga Drain. (Giga Drain isn't a TM.) Oddish, Gloom, Paras, Parasect, Hoppip, Skiploom, Jumpluff, Sunkern, Treecko, Beautifly, Shroomish, Roselia, Turtwig, Grotle, Torterra, Leageon, Snivy, Servine, Serperior, Cottonee, Petilil, Maractus, Foongus, Amoonguss, Shelmet, Accelgor, and Virizion.