Originally Posted by Fat Deck Knight
Could you explain the EVs a little? Most Necturna are physical attackers, whereas this Drapion maxes Special Defense. I get it has Dark STAB for Necturna, but why does it have Earthquake? Base 90 Atk uninvested is not very powerful. Not to mention if Necturna burns you with Sacred Fire, Drapion is almost useless.
The EVs and Earthquake are just to cover the bases. Although Necturna is very common nowadays, I won't always be facing it (or I'll be facing a rare special Necturna), and Drapion needs to augment its low special defense to survive as a reliable Toxic Spiker. Earthquake deals somewhat with Steel and Poison pokemon that switch in to stop the Toxic Spikes.
You could easily add more attack and/or defense (or speed, but the 144 EVs needed to always outrun neutral Necturna are pretty straining defensively) to the EV spread to deal with Necturna or be a greater physical threat, but I personally went for more general survivability. If this is going to be the only Toxic Spikes user on my team, I need it to last against other things than just Necturna.
As for Sacred Fire, it hasn't really been a problem, as the primary point of the set is laying hazards; it can still get its 2 layers in. Admittedly, this set does do better against more defensive Necturna sets.