Source: http://www.smogon.com/forums/threads/dp-research-thread-3-newer.26660/page-4#post-554010

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Peterko, Aug 8, 2007
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	SKY ATTACK

	-tested this with lv.100 moltres against those route 1 (101?) lv. 2-3 pkmn
	Results: the exact 8 PP tries (hits/CHs): 7/1, 6/2, 8/0, 8/0, 5/1, 7/0, 6/0, 7/1, 6/0, 6/0, 7/0, 7/1, 6/0, 8/1, 7/0, 7/1 -> 

	128 sky attacks
	108 hits = 84,375% accuracy
	8 CHs = 7,4% (8/108 ), but exactly 6,25% (8/128 ) out of all sky attacks, which is 1/16, the basic CH chance in the game

	-> sky attack does not have a high CH chance (but it should have a 30% flinch chance)

November 3rd, 2006

Obi is fast :D and remembers my research

anyway, I can retest this in D/P (caught a noctowl yesterday, what a coincidence)...I must say that the 30% flinch idea comes from a pokédex, as it was not possible for those low level targets to survive that one
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Source: http://www.smogon.com/forums/threads/dp-research-thread-3-newer.26660/page-4#post-554102
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Peterko, Aug 8, 2007
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Lv. 35 noctowl @ wide lens using sky attack against partner Lv.35 wobbuffet 

Sky Attack ingame description: "A second-turn attack move with a high critical-hit ratio. It may also make the target flinch."
Sky Attack 1st turn message: "Noctowl became cloaked in a harsh light!"

2/8 flinches, 0/8 CHs
2/8 flinches, 0/8 CHs
1/8 flinches, 2/8 CHs
2/8 flinches, 1/8 CHs
1/8 flinches, 0/8 CHs
1/6 flinches, 0/6 CHs, 2 missed
3/8 flinches, 0/8 CHs
2/6 flinches, 0/6 CHs

pachirisu struggle recoil fainted

TOTAL:
14/60 flinches = 23.33%
3/60 CHs = 5%

-> flinch rate seems to be 25% (we can tell that for sure after king´s rock has been tested)
-> although the description says so, sky attack doesn´t seem to have a high critical-hit ratio
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