Caterpie is easy to capture and grows quickly, making it ideal for new Trainers. As Caterpie grows and develops over time, it will shed its skin many times before finally cocooning itself in thick silk.
Metapod's soft body is protected by a hard outer shell as it undergoes metamorphosis. While this shell is said to be as hard as steel, a sudden, powerful impact could cause its liquid innards to pop out, leaving it completely exposed. Metapod generally remains motionless, rebuilding its cells for evolution. If an enemy discovers Metapod, it is unable to do anything other than harden its outer shell.
The wings of Butterfree are coated with poisonous scales that easily fall off continuously as it flies. If inhaled, it results in several status conditions. It will defend Caterpie from bird Pokémon using this powder. This powder also repels water, enabling it to fly and gather honey even in the rain. Butterfree can use its sensitive antenna to detect the odors of blooming flowers six miles (ten kilometers) from its nest in search of nectar, which it carries with the hairs of its legs.
Weedle is a larval insect Pokémon with a segmented body ranging in color from yellow to reddish-brown. Each segment of its body is a sphere. It has a bulbous red nose, two small, black eyes on its face and two spherical feet on each body segment. The combination of red and yellow in its color scheme creates a bright warning to predators that it is poisonous.
Kakuna is a yellow, insect cocoon-like Pokémon. Kakuna has a dome-shaped head and black, triangular eyes with glowing white pupils. It has two scythe-like arms in the middle of its body. When it comes close to evolving, its body gives off heat that makes it warm to the touch.
Beedrill's head is round with a slightly pointed mouth; large, red eyes; and black antennae with a sharp bend in the middle. Its forelegs are tipped with long, conical stingers. It stands on its other two legs, which are long, segmented, and insectoid in shape. Beedrill has two pairs of rounded, veined wings, and another stinger on its yellow-and-black striped abdomen. The abdomen stinger contains Beedrill's most potent poison.
Pidgey has an extremely sharp sense of direction and homing instincts. It can travel straight back to its nest regardless of how far away they might have flown. It is a docile Pokémon and generally prefers to flee from its enemies rather than fight them. By flapping its wings rapidly, it can whip up dust clouds and create whirlwinds to protect itself and flush out potential prey
Pidgeotto, an evolved form of the Pidgey. It is armed with sharp claws and dives from the sky to capture its prey. Unlike the more gentle Pidgey, Pidgeotto can be dangerous. Approach with extreme caution.
Pidgeot's powerful wings are capable of stirring up windstorms in just a few flaps, and it may spread its wings to intimidate enemies. This Pokémon is capable of flying faster than the speed of sound.