Generation I refers to Red, Green, Blue, and Yellow Generation II refers to Gold, Silver, and Crystal Generation III refers to Ruby, Sapphire, FireRed, LeafGreen, and Emerald Generation IV refers to Diamond, Pearl, Platinum, HeartGold, and SoulSilver Generation V refers to Black, White, Black 2, and White 2 Generation VI refers to X, Y, Omega Ruby, and Alpha Sapphire Generation VII refers to Sun, Moon, Ultra Sun, Ultra Moon, Let's Go, Pikachu!, and Let's Go, Eevee! and Generation VIII refers to Sword, Shield, Brilliant Diamond, Shining Pearl, and Legends: Arceus. The vast array of creatures are commonly divided into 'Generations', with each division primarily encompassing new titles in the main video game series and often a change of handheld platform. Each iteration of the series has brought about praise and criticism over the numerous creatures. Sugimori and Hironobu Yoshida lead the team and determine the final designs. However, by 2013 a team of 20 artists worked together to create new species designs.

Originally, only a handful of artists led by Ken Sugimori designed Pokémon. There are also some of them that cannot evolve. Many Pokémon are capable of evolving into more powerful species, while others can undergo form changes and achieve similar results. The designs for the multitude of species can draw inspiration from anything such as animals, plants, mythological creatures and inanimate objects. Conceived by Satoshi Tajiri in early 1989, Pokémon are creatures that inhabit the fictional Pokémon World. The Pokémon franchise revolves around 901 fictional species of collectible monsters, each having unique designs, skills, and powers.

The first 150 Pokémon as they appear in Pokémon Stadium, starting with Bulbasaur in the top left corner and ending with Mewtwo in the bottom right corner.

Original official pokemon handbook