Question

If you can use this strategy correctly you can one hit KO a opponents team.

Answer 1

25% because with the high critical hit move with razor claw move brings it up to level 3 being 25% chance. This is a 1/4 chance so you should expect a critical hit every 4 turns.
Source: http://bulbapedia.bulbagarden.net/wiki/Critical_hit#Critical_hit

Comments

Scroll further to where you get to the....Nevermind. Just look at these charts. http://bulbapedia.bulbagarden.net/wiki/Damage_modification#Generation_II_onwards

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ronnoc is actually correct.

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stop downvoting.  just read my source and you will see.  level one is original.  Level 2 would be because of leaf blade.  Level three would be because of razor claw.  Appearantly you guys dont understand that regular moves begin at level one not level 0.

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WHAT. It starts at stage ONE? I never knew that my bad.

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thank you mew ;)