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

Pidgeotto
Pidgeotto 		Base
stats		 Stats Effort Stats Effort Stats Effort Stats Effort Stats Effort Stats Effort Stats Effort Possible genes (IVs)
Level Level Level Level Level Level Level
HP 63
50–56
52–58
55–61
57–63
64–71
68–76
71–79
28
Attack 60
26–32
27–33
29–35
30–36
33–41
36–44
37–45
28
Defense 55
24–30
25–31
27–33
28–34
31–38
33–41
34–43
28
Special Attack 50
23–28
24–29
25–31
26–32
29–36
31–39
32–40
28
Special Defense 50
23–28
24–29
25–31
26–32
29–36
31–39
32–40
28
Speed 71
30–36
31–37
33–39
34–41
39–46
41–49
43–51
28

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

This Pidgeotto's Hidden Power inflicts Fighting damage, with 30 power.

And for your copy/pasting pleasure:

28 HP; 28/28 Physical; 28/28 Special; 28 Speed

or start over