Critical Hit Ratio

[Lt. Surge]

I'm thinking of teaching a Pokemon I like Focus Energy, while supplementing that increase in Critical Hit Ratio with an item like Razor Fang. I haven't tried this yet, by what percentage do you think (or you know) I would have the probability of landing Critical Hits?

[Delta Blast Burn]

All the info you need

http://serebii.net/games/criticalhits.shtml

[Kaphotics]

The base stage is always 1. Then you have focus energy, which is a +1 to a normal stage 1 attack (stage 2). With an increased CH move, it's now 2+1, which is 25% (stage 3).

Spoiler

Thought you wanted to make a code. Leaving it anyways :P
Take a look at it in hex.

6.25....6.25*16=100%
12.5...12.25*8=100%
25...25*4=100%
50...50*2=100%
and
33.3*3 =100%

Your common multiples you need are 16 and 3, which is 48. 48 is 3 halfbytes of hex.

Find how it is calculated from the RNG, figure out where each bit influences the crit rate, and then trace it back to the original calc. Modify that calculation so that your Critical Hit ratio is as desired.