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

Golbat
Golbat 		Base
stats		 Stats Effort Stats Effort Stats Effort Stats Effort Stats Effort Stats Effort Possible genes (IVs)
Level Level Level Level Level Level
HP 75
65–71
67–74
70–77
72–80
75–83
80–88
19
Attack 80
40–47
41–48
43–50
45–52
46–54
49–58
30
Defense 70
35–42
37–44
38–46
40–47
41–49
44–52
15
Special Attack 65
33–40
34–42
36–43
37–45
38–46
41–50
5
Special Defense 75
38–44
39–46
41–48
42–50
44–52
47–55
10
Speed 90
44–51
46–53
48–55
50–57
51–59
55–64
30

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

This Golbat's Hidden Power inflicts Bug damage, with 59 power.

And for your copy/pasting pleasure:

19 HP; 30/15 Physical; 5/10 Special; 30 Speed

or start over