Various unused move effects (Generation I)
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In Red/Blue/Yellow there are unused move effects for outcomes for used effects, but with a different stat, such as raising Speed by one stage instead of raising Defense by one stage (Harden uses this) or a low chance of lowering Accuracy by one stage instead of lowering Special by one stage (used by Psychic). As is relatively well known, some glitch moves use these effects.
A list of possibly all effects can be found here. http://hax.iimarck.us/files/rbymoveinfo.txt and you can edit offset $38001 in either Red/Blue or Yellow to modify the effect of Pound.
The effects that seem to be definitely unused are 0x36, 0x37, 0x3A, 0x3C, 0x3D, 0x3E, 0x3F, 0x48, 0x49 and 0x4A/0x4B (though I haven't recorded those two as they seem to have no effect). 30.1% chance of freeze is apparently used for Blizzard in the Japanese releases.
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