Butterfree: combination of BUTTERFLY and FREE. Thus, a butterfly that flies freely, as all butterflies should.
Poke-DEX
10.Caterpie
11.Metapod
12.Butterfree
Caterpie:  shortening of CATERPILLAR, which Caterpie resembles
Metapod: from METAMORPHOSIS and POD. Metapod resembles the pod, chrysalis, or cocoon, within which many insects in nature undergo metamorphosis from crawling bugs into flying bugs. The evolution of Caterpie to Metapod to Butterfree closely mirrors the metamorphosis in nature of caterpillar to chrysalis to butterfly.
Caterpie
Number: 10
Type: Bug
Species: Worm
Height: 1' 0''
Weight: 6 lbs.
Metapod
Number: 11
Type: Bug
Species: Cocoon
Height: 2' 4''
Weight: 22 lbs
Butterfree
Number: 12
Type: Bug/Flying Species: Butterfree
Height: 3' 7''
Weight: 71 lbs.
10-
Caterpie
-
-
-
-
-
-
-
-
-
-
-
-
11-
Metapod
-
-
7
-
-
-
-
-
-
-
-
-
12-
Butterfree
-
-
-
10
13
14
15
18
23
28
34
40

Attack
Tackle
String Shot
Harden
Confusion
Poison Powder
Stun Spore
Sleep Powder
Supersonic
Whirlwind
Gust
Psybeam
Safeguard

Type
Normal
Bug
Normal
Psychic
Poison
Grass
Grass
Normal
Normal
Flying
Psychic
Normal
Pokemon Top 40 Site List

Pre-Evolution

Basic

Stage 1

Stage 2

None

-

Caterpie

7

Metapod

10

Butterfree

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