Charmander is a bipedal, reptilian Pokemon with an orange body, though its underside and soles are cream-colored. It has two small fangs visible in its upper and lower jaws and blue eyes. Its arms and legs are short with four fingers and three clawed toes. A fire burns at the tip of this Pokémon’s slender tail, and has blazed there since Charmander’s birth. The flame can be used as an indication of Charmander's health and mood, burning brightly when the Pokémon is strong, weakly when it is exhausted, wavering when it is happy, and blazing when it is enraged. It is said that Charmander dies if its flame goes out. Charmander can be found in hot, mountainous areas. However, it is found far more often in the ownership of Trainers. As shown in Pokémon Snap, Charmander exhibits pack behavior, calling others of its species if it finds food.

Bulbasaur is a small, quadruped Pokemon with green to bluish-green skin and dark patches. It has red eyes with white pupils and sclera and pointed, ear-like structure on top of its head. Its snout is short and blunt, and it has a wide mouth. A pair of small, pointed teeth visible in the upper jaw when its mouth is open. Each of its thick legs ends with three sharp claws. On its back is a green plant bulb, which is grown from a seed planted there at birth. The bulb provides it with energy through photosynthesis as well as from the nutrient-rich seeds contained within.

Squirtle is a small Pokemon that resembles a light blue turtle. While it typically walks on its two short legs, it has been shown to run on all fours in Super Smash Bros. Brawl. It has large brown eyes and a slightly hooked upper lip. Each of its hands and feet have three pointed digits. The end of its long tail curls inward. Its body is encased by a tough shell that forms and hardens after birth. This shell is brown on the top, pale yellow on the bottom, and has a thick white ridge between the two halves. Squirtle's shell is a useful tool. It can withdraw into the shell for protection or for sleeping, and its grooved, rounded shape helps to reduce water resistance when this Pokémon swims. Squirtle can spray foamy water from its mouth with great accuracy. Squirtle is scarce in the wild, although it can be found around small ponds and lakes. The anime has shown that it can be found living on secluded islands with other members of its evolutionary line.

Pikachu is a short, chubby rodent Pokemon. It is covered in yellow fur, and its ears are long and pointed with black tips. It has a small mouth, brown eyes, and two red circles on its cheeks. There are pouches inside its cheeks where it stores electricity. Its forearms are short, with five fingers on each paw, and its feet have three toes. It has two brown stripes on its back, and its tail is in the shape of a lightning bolt with a patch of brown fur at the base. The anime has shown that Pikachu sometimes travel in groups. It raises its tail to check its surroundings, and is occasionally struck by lightning in this position. Living in forested areas, Pikachu is found foraging for berries it roasts with electricity to make them tender enough to eat. It has been observed eating and sometimes destroying telephone poles, wires, and other electronic equipment. Pikachu is able to release electric discharges of varying intensity. Pikachu has been known to build up energy in its glands, and will need to discharge to avoid complications. It is also able to release energy through its tail, which acts as a grounding rod, as well as recharging fellow Pikachu with electric shocks. When threatened, it looses electric charges from its sacs, and a group can build and cause lightning storms. It is found mostly in forests, where a sure sign that Pikachu inhabits a location is patches of burnt grass.