For example, a spot where it tells me that a certain pokemon can get attack power to a certain stat, like a salamence can get it to 405.
You can see that on this site! Just go to a Pokedex e.g. Tyranitar and look under "Tyranitar stats", at the numbers to the right to see all the possible stats at level 100. For Tyranitar, its minimum possible Attack is 245 and maximum is 403.
Go to serebii.net, type in the name of the Pokemon you want, then go to the 4th generation Pokedex for that Pokemon. Scroll down to the bottom of the page.