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Alakazam @ Focus Sash
Ability: Magic Guard
EVs: 4 Def / 252 SpA / 252 Spe
Nature: Timid
- Psychic / Psyshock
- Focus Blast
- Shadow Ball
- Hidden Power [Ice]
It avoids the KO on the switch, even with Stealth Rock / Spikes / Toxic Spikes / Sandstorm, since Magic Guard prevents all those things from dealing damage and Focus Sash ensures that it doesn't faint from one single hit. Alakazam will then outspeed and swiftly OHKO with HP Ice.
The problem with using that to counter Landorus is that the opponent will simply switch out. When Landorus comes back in, you will no longer be able to switch into it. It's a check at best, but not a counter.