1.) Besides Horn Drill, what else attack are 1 Hit KO
2.) is there a TM for LockDown? (For any move that 100% wont miss next turn)
1. As mentioned above, Fissure. Another is Sheer Cold.
2. No there isn't a TM for LockDown. Unless you're meaning something else, as I don't recall a move called LockDown.
I take it you want these moves so you can have a combo of a never miss move, and a OHKO move, am I right? BAD stradegy, every normal person would switch out, so don't bother.
Destiny Bond could also be theoratically called a OHKO move, altought it requires certain conditions to be met.
Mirror Coat too has always massacred me. I don't even know what the move does and I hate it. Every time it actually does hit it seems to OHKO me.
But yeah, Lock-On/OHKO move is a bad strategy for competitive play. In game it works fine, since the AI is too stupid to switch out. But for out of game play, you could make better use of those two move slots.
I take it you want these moves so you can have a combo of a never miss move, and a OHKO move, am I right? BAD stradegy, every normal person would switch out, so don't bother.
Any paranoid person would.
(And just to add more to my post)
Using lock on and a one hit KO move is the kind of obvious strategy that works now because people are likely to think "Oh man there's no way he's going to try something that stupid." :D