Update today. No new stats, but I've fixed a couple errors (I apparently had Singularis listed as a dark type), tweaked some formatting, added a couple more skills (instant kill skills and life % reduction skills: like Timerion's Equalize, Totem's life reduction, or MMOnster's skill draining 25% of the target's life).
I also added a new column on each sheet labelled "Have". If you have the monster in your collection, just put an "X" or something in that cell. So long as you're consistent, you can then filter straight to the ones you have. If you use this feature, it will require a bit on your part with every future update.
When an update comes out, don't overwrite or delete your old file. In your old file, first make sure to clear all your filters, then copy the cells from B2 through the end of the table. DO NOT simply copy the whole column. Open up the new file and click on the B2 cell and paste it.
You don't have to use it, I just wanted to make the feature available for those that might.