Metapod

Enduring hardships,

Awaiting evolution,

A hard shell protects.

...

Butterfree

Free from the hard shell,

Dwelling amongst the flowers,

Eating sweet honey.

...

Weedle

A powerful sting,

Poisoning those who oppose;

Eating all the leaves.

...

Kakuna

Hiding from all foes,

Under leaves; in nooks of trees,

Waiting to evolve.

...

Beedrill

Flying at high speeds,

Striking with poison needles,

Swarming their victims.

...

Pidgey

Don't disturb Pidgey!

It will strike back fiercely.

The docile bird strikes.

...

Pidgeotto

Searching for weak prey;

Strong claws striking at others,

Flying and swooping.

...

Pidgeot

Keen eyes glimmering,

Bending tall trees with its wings;

Making gusts of wind.

...

Rattata

Extremely cautious,

Their powerful teeth gnaw down;

Biting weaker foes.

...

Raticate

Fangs growing always,

Chewing apart cinder walls;

They gnaw their fangs down.