Roselia learn giga drain at 25 before evolve to roserade.
Treecko will learn: Pursuit(level 16), Screech(level 21), Mega Drain(level 26), Agility(level 31), Slam(level 36), Detect (level 41), and Giga Drain(level 46)
Stoutland learns Giga Impact at level 59.
In Pokémon Black 2, Giga Drain can be found as a level-up move with Pokémon however there is also a Move Tutor in Humilau City that will be able to give Giga Drain to Pokémon. Pokémon that can learn Giga Drain via level up are Oddish, Paras, Tangela, Hoppip, Sunkern, Treecko, Shroomish, Beautifly, Turtwig, Roselia, Snivy, Leafeon, Cottonee, Maractus, Petilil, Foongus, Shelmet and Virizion.
He doesn't, you either have to evolve him into Electivire and level him up or teach him Giga Impact via tm
paras learns stun spore at level 6 , spore at level 17 , giga drain at level 33 and Aromatherapy at level 38
100
Level 25
In Generation IV, Sceptile can be taught TM19 Giga Drain. In Generation V, only Treeko can learn Giga Drain at level 46. Treeko evolves into Grovyle at level 16 and Grovyle evolves into Sceptile at level 36.
lv 51
No. It can't learn Mega Drain but it can learn Giga Drain.
Treecko will learn: Pursuit(level 16), Screech(level 21), Mega Drain(level 26), Agility(level 31), Slam(level 36), Detect (level 41), and Giga Drain(level 46)
Lombre cannot learn Giga Drain. It can be learned, if bred with a Pokemon who knows the move.
giga drain
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.
In Pokemon Beautifly learns the move silver wind at level 34. This Pokemon learns giga drain when it reaches level 38.
Stoutland learns Giga Impact at level 59.
In Pokémon Black 2, Giga Drain can be found as a level-up move with Pokémon however there is also a Move Tutor in Humilau City that will be able to give Giga Drain to Pokémon. Pokémon that can learn Giga Drain via level up are Oddish, Paras, Tangela, Hoppip, Sunkern, Treecko, Shroomish, Beautifly, Turtwig, Roselia, Snivy, Leafeon, Cottonee, Maractus, Petilil, Foongus, Shelmet and Virizion.