Is it just me or is the "Include Pokémon from later generations" whitelisting option not working properly?

[LOuroboros]

I checked the Generations 3, 4, 5 and 6 checkboxes while disabling/unchecking the Generations 1 and 2 checkboxes. Then I proceeded to generate a ROM and I had the 3 Kanto Starters to choose.
At the same time, the Routes 1 & 22 had nothing but the usual Kantoian Pokémon (Rattata, Pidgey, Spearow, etc).

I don't really know if it's an issue or if I'm simply misunderstanding how the function in the website works but one thing I'm sure of, is that Seedot (a 3rd Gen. Pokémon) or his sprite at the very least is implemented inside the ROM as it appeared during Oak's Introduction.

I don't know if it's required or if it'd be helpful, but here's a .ips patch of said ROM.
https://www.dropbox.com/s/48jwaks66lyfbba/Lunos.ips?dl=0

Also, a pic of that Seedot in the introduction:

[Sanqui]

You've probably opted not to randomize wild Pokémon, which means that the original Pokémon will appear in the wild.

[LOuroboros]

Ohh, ohkay. I thought that disabling Gen. 1 and 2 actually removed the Pokémon belonging to them from the ROM or something. Thanks for clarifying that @Sanqui 👍

Now, I made a new ROM, I unchecked Gen. 1 and 2 Pokémon again, I only had the Generations 3, 4, 5 and 6 checked, and I also randomized the wild Pokémon.
In the Starter Pokémon, I told the Randomizer to pick Pokémon with 3-stage lines randomly.
Which is the 1st Pokémon in Oak's table? Pidgey.

EDIT: 3rd one? Bellsprout.

These were the options that I chose, just in case.

[Sanqui]

Both Pidgey and Bellsprout are 3-stage lines. :)

By the way, you chose not to randomize trainer Pokémon.

I fully intend on replacing all this ton of options with something more straightforward, but it'll take a bit of time still.

[LOuroboros]

Ohkay, I guess that it's not possible to build a ROM that only has Gen. 3, 4, 5 and 6 Pokémon then? x.x
I'm gonna check a ROM with these options to see what happens before giving up.

In any case, I still freaking love this randomizer. It's an incredible piece of work and the only sad thing is that most likely nobody will ever grab it and expand it to Pokecrystal or Pokeruby.
Alright, I guess I'll take my leave now. Sanqui, seriously dude, thank you very very much for making this ❤️

[Sanqui]

It is possible to build a ROM like that, and these settings should work for it! Just, if you ask the randomizer to keep some sort of pokémon, it forces the original 151 in. Sorry, I know it's sorta unintuitive, I'll be changing it.

You're welcome! I'm still intend on improving the randomizer if I find some free time.