Look at the stats:
Magical Leaf - 60 Damage/20 PP
Giga Drain - 60 Damage/10 PP, plus 50% of damage done is added to your Pokemon.
Personally I would always go for Magical Leaf due to it's better PP, but it depends on your battle style.
Chat with our AI personalities
giga drain,leaf blade,solarbeam, and frenzy plantthe only thing about above is that sceptile probably can't learn frenzy plant without hacks but if it can it could only be done in fire red or leaf greenI would say:SolarbeamLeafbladeSlamand i guess giga drain
moves like curse bite earthquake razor leaf chomp grass hammer giga drain drain health mega drain and more!
Magical Leaf isn't a TM.
lvl1 Tackle lvl4 Leer lvl7 Vine Whip lvl10 Wrap lvl13 Growth lvl16 Leaf Tornado lvl19 Leech Seed lvl22 Mega Drain lvl25 Slam lvl28 Leaf Blade lvl31 Coil lvl34 Giga Drain lvl37 Wring Out lvl40 Gastro Acid lvl43 Leaf Storm
In Pokémon Black, the moves that Serperior is capable of learning via level up are ones such as Leer, Tackle, Wrap, Vine Whip, Leech Seed, Growth, Leaf Tornado, Slam, Mega Drain, Leaf Blade, Giga Drain, Coil, Gastro Acid, Wring Out and Leaf Storm.