Are there any Pokemon missing from Polkamon?

[Petzbreeder]

I love the Polkamon song by Weird Al, I'm just wondering if they missed out any Gen 1 Pokemon, and if so, which ones.
Ledyba, Marill, Slowking, Snubbull, Elekid and Lugia were the only Gen 2 Pokemon that were mentioned, as far as I can remember.

Here are the lyrics.

Bellossom is another Gen 2 Pokemon added in.

[The Hooded Trainer]

Yeah, he missed out a ton. I don't think he even touched on half of gen 1. Hell, he didn't even get mewtwo, mew or charizard. Oh, and he mentioned ditto twice for some reason. Still, it's a pretty catchy song.