Regions
The Pokédex number depends on which game you are playing. Bulbasaur is #001 in Kanto and #068 in Galar, and in Paldea it is not there at all. These lists show the species the way the game orders them — in regional, not national, order.
Some regions are listed twice because later releases added species: “original” is the version from the first game in the region, “updated” — after an expansion or a third version. The numbers in the two can be completely different.