PokéBase - Pokémon Q&A
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2 Answers

2 votes
 
Best answer

No, you can't. The move will fail.

Last Resort inflicts damage and has no secondary effect. However, it cannot be used until all other moves that the user knows have been fully executed, at least once, during the battle.

>This counter resets if the user switches out, faints, or the battle ends. Last Resort will fail if it is the only move the user knows.

-Bulbapedia

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The way Last Resort is usually used is along with just Fake Out. Although in actual competitive, don't expect it to be of any use.
3 votes

Last resort will fail if it is the only move the user knows
-Bulbapedia

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Too slow again -_-