Question

How did he get in? I saw it on the site tiers.

Answer 1

He can perform a FEAR sweep.
http://www.youtube.com/watch?v=oJxvmtCwAZY
Watch this and you'll see
NOTE: If the opponent's Pokemon is a Ghost, Rock, Ground, or Steel type, the sweep will FAIL.

Comments

Also if there is a Ghost Type.

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thanks

Answer 2

It's because of the F.E.A.R. set. It's basically where you have a Level 1 Aron, with Sturdy, Endeavor, you have Sandstorm up, and you are holding the Shell Bell or Leftovers. Since you are Level 1, you'll get OHKO'd by anything, except since you have Sturdy, you won't die. You use Endeavor, and your opponent gets down to 1 HP. Then the Sand finishes them off.

NOTE: I commented on this on the tier page here.

Comments

Leftovers wouldnt ruin the set, as the sandstorm damage kicks in first, and only then the leftovers will heal, meaning that you will die first.

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You're right, and I've edited that. Thanks NJ.