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

Ariados
Ariados 		Base
stats		 Stats Effort Stats Effort Stats Effort Stats Effort Stats Effort Stats Effort Stats Effort Stats Effort Possible genes (IVs)
Level Level Level Level Level Level Level Level
HP 70
62–69
65–72
67–75
70–77
72–80
74–83
82–91
91–102
31
Attack 90
44–51
46–53
48–55
50–57
51–59
53–61
59–68
66–76
23
Defense 70
35–42
37–44
38–46
40–47
41–49
42–51
47–56
52–63
6
Special Attack 60
31–38
32–39
33–41
35–42
36–44
37–45
41–50
45–56
14
Special Defense 70
35–42
37–44
38–46
40–47
41–49
42–51
47–56
52–63
4
Speed 40
22–29
23–30
24–31
25–32
25–33
26–34
29–38
32–42
1

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

This Ariados's Hidden Power inflicts Poison damage, with 44 power.

And for your copy/pasting pleasure:

31 HP; 23/6 Physical; 14/4 Special; 1 Speed

or start over