The Pokémon franchise revolves around 1,015 fictional species of collectible monsters, each having unique designs, skills, and powers. Conceived by Satoshi Tajiri in early 1989, Pokémon are fictional creatures that inhabit the fictional Pokémon World. The designs for the multitude of species can draw inspiration from anything such as animals, plants, and mythological creatures. Many Pokémon are capable of evolving into more powerful species, while others can undergo form changes and achieve similar results. Originally, only a handful of artists led by Ken Sugimori designed Pokémon. However, by 2013 a team of 20 artists worked together to create new species designs. Sugimori and Hironobu Yoshida lead the team and determine the final designs. Each iteration of the series has brought about praise and criticism over the numerous fictional creatures. The vast array of creatures is commonly divided into "Generations", with each division primarily encompassing new titles in the main video game series and often a change of handheld platform. 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!; Generation VIII refers to Sword, Shield, Brilliant Diamond, Shining Pearl, and Legends: Arceus; and Generation IX refers to Scarlet and Violet. Each Generation is also marked by the addition of new Pokémon: 151 in Generation I in the Kanto region, 100 in Generation II in the Johto region, 135 in Generation III in the Hoenn region, 107 in Generation IV in the Sinnoh region, 156 in Generation V in the Unova region, 72 in Generation VI in the Kalos region, 88 in Generation VII in the Alola and Kanto regions, 96 in Generation VIII in the Galar and Hisui regions, and 110 in Generation IX in the Paldea region. Due to the large number of Pokémon, listing of each species is divided into articles by generation. The 1015 Pokémon are organized by their number in the National Pokédex—an in-game electronic encyclopedia that provides various information on Pokémon. The National Pokédex is subdivided into regional Pokédex series, each revolving around species introduced at the time of