Pokémon Family Species: Gen I (Bulbasaur to Parasect / Venonat to Cloyster / Gastly to Miltank / Magikarp to Mew) | Gen II (Chikorita to Granbull / Qwilfish to Celebi) | Gen III (Treecko to Sharpedo / Wailmer to Deoxys) | Gen IV | Gen V (Victini to Zoroark / Minccino to Genesect) | Gen VI (Chespin to Hawlucha / Dedenne to Volcanion) | Gen VII (Rowlet to Comfey / Oranguru to Melmetal / Ultra Beasts) | Gen VIII (Grookey to Hatterene / Impidimp to Calyrex) | Glitches
Pokémon Human Characters: Protagonists And Rivals (Kanto / Johto / Hoenn / Sinnoh / Unova / Kalos / Alola / Galar) | Professors | Gym Leaders (Kanto / Johto / Hoenn / Sinnoh / Unova / Kalos / Galar) | Trial Captains and Kahunas | Elite Four | Champions
Pokémon Villain Teams: Team Rocket / Team Aqua/Magma / Team Galactic / Team Plasma / Team Flare / Team Skull / Team Yell
Frontier Brains And Other Facility Heads | Trainer Classes | Other NPCs (Aether Foundation / Ultra Recon Squad / Macro Cosmos)
Clocking at an even 100, this generation introduced the fourth least number of Pokémon out of all 8, and, out of those, only 81 were not related via evolution with Pokémon of the previous generation (and 2 of those are still close to Generation I Pokémon).
Generations III and IV introduced 12 Pokémon related with the ones covered here, bringing the total of Pokémon originating from this generation to 93. Due to the Mission-Pack Sequel nature of Gold and Silver, some of the things expected from other generations are absent here; there are no fossil Pokémon, the new early mammal is not everywhere, etc. Legendary version mascots and Roaming Pokémon first appear here, as do unconventional evolution methods. Many Pokémon that originated from Generation II are "cuter" then their Generation I brethren, as most feature bright colors and rounded simplified designs, compounded with the introduction of baby Pokémon in this generation. If Gen I Pokémon resemble Kaiju, then Gen II's Pokémon take cues from Sanrio characters.
For other generations, go here.