Ok, so here's how it would work, it would let you search for different base stats, like if you search for Pokémon with 100 base HP stats, it would show you all the Pokémon with 100 base HP stats.
I've considered adding an advanced search feature, where you would search Pokemon by various attributes like this.
In the meantime, however, your specific request can be done using the Pokemon list. Sort a column by the stat you're interested in (e.g. HP), then scroll down and all the Pokemon with 100 HP will be grouped together.