WHIRLWIND EXPLANATION: Pokémon have a fixed, permanent score from 0 to 31 for each stat that affects how good that stat can ever get.

This calculator will figure out that score (called a "gene" or, more obtusely, an "IV") for you, so you can discard the unworthy. It's more accurate for higher-level Pokémon, so it's helpful to go into a level 100 wifi battle with someone and check your Pokémon's stats from there.

Stat calculator

Pokémon
Nature
Characteristic
Hidden Power type

Snorlax	Base stats	Stats	Possible genes (IVs)
		Level
HP	160	425–456	31
Attack	110	222–253	31
Defense	65	133–164	31
Special Attack	65	133–164	31
Special Defense	110	222–253	31
Speed	30	64–95	31

Congratulations, you've narrowed your Pokémon's stats down exactly!

This Snorlax's Hidden Power inflicts damage, with 70 power.

And for your copy/pasting pleasure:

31 HP; 31/31 Physical; 31/31 Special; 31 Speed

or start over