Including 2020's Brand New Gen 8 Pokemon

Over the last 20 years, literally hundreds of new Pokemon have been discovered — but, how many Pokemon are there now?
With the 2019 introduction of Pokemon Sword & Shield and 2020's update to the National Dex with The Isle of Armor and The Crown Tundra expansion, there are now 898 Pokemon (as of 11/11/2020).
The National Dex now begins with #001 Bulbasaur and ends with #898 Calyrex which, ironically, are both part grass types! Another fun fact is that both Bulbasaur and Calyrex have bulbs — bulbasaur has a bulb on its back and Calyrex has one on its head.
Click here to view the complete National Dex >>
Generation 1 introduced 151 Pokemon
#001 Bulbasaur to #151 Mew
Pokemon Red version, Pokemon Blue version, Pokemon Yellow version
Generation 2 introduced 100 new Pokemon
#152 Chikorita to #251 Celebi
Pokemon Gold version, Pokemon Silver version, Pokemon Crystal version
Generation 3 introduced 135 new Pokemon
#252 Treecko to #386 Deoxys
Pokemon Ruby version, Pokemon Sapphire version, Pokemon Emerald Version, Pokemon Fire Red version, Pokemon Leaf Green version
Read more: Nuzlocke Rules for Pokemon - what are they?
Generation 4 introduced 107 new Pokemon
#387 Turtwig to #493 Arceus
Pokemon Diamond version, Pokemon Pearl version, Pokemon Heart Gold version, Pokemon Soul Silver version
Generation 5 introduced 156 new Pokemon
#494 Victini to #649 Genesect
Pokemon Black version, Pokemon White version, Pokemon Black 2 version, Pokemon White 2 version
Generation 6 introduced 72 new Pokemon
#650 Chespin to #721 Volcanion
Pokemon X version, Pokemon Y version, Pokemon Omega Ruby version, Pokemon Alpha Sapphire version
Generation 7 introduced 88 new Pokemon
#722 Rowlet to #809 Melmetal
Pokemon Sun version, Pokemon Moon version, Pokemon Ultra Sun version, Pokemon Ultra Moon version, Pokemon Let's Go Pikachu version, Pokemon Let's Go Eevee version
Generation 8 introduced 89 new Pokemon
#810 Grookey to #898 Calyrex
Pokemon Sword version, Pokemon Shield version, The Isle of Armor Expansion, The Crown Tundra Expansion