The plan is to use Discharge with a scarfed Raichu with a Modest Nature so my Sceptile gets the boost.
Here's the thing; my Sceptile has 0 HP IVs but I really like Giga Drain so I don't know what to do!
Sceptile @ Sceptilite
252 Sp.atk/252 Spd/4 HP
-Energy Ball/Giga Drain
I would say Giga Drain even though it has 15 less base power than Energy Ball because you can restore health with it, which can be helpful in tight situations and just all-around good.
As you can see Giga Drain would be a better choice than Energy Ball.And Giga drain damage is based on special attack IVs not HP IVs.