I guess I must repeat myself.
DO NOT USE NIGHT SHADE OVER SEISMIC TOSS.
You will NOT stay against Ghost-type Pokemon, because they can AND WILL damage you super-effectively. Normal-type Pokemon are the ones you want to wall. Seismic Toss is always the better option and Night Shade should not even be mentionned anywhere.
Burn or Toxic will both work well against most Normal-types (who are, for the most part, physical attackers, anyhow). And Normal-types are almost nonexistent outside of Chansey/Blissey, who you stall anyhow. Togekiss is pretty much the only other Normal-type out there, and it can easily set up on you regardless of Seismic Toss due to access to Roost, unless you are using Toxic (in which case, it will end up dying, I believe, even if you use Night Shade instead). I'm sorry, but I don't see the point. It can wall Normal-types regardless of if it has Seismic Toss or Night Shade. May as well get a hit on any Ghost-types switching in to suck up a falsely predicted Seismic Toss.
-Zane

