These are not beta designs, but in Red & Green, Dratini and Dragonite had a few differences compared to the present ones.

2 22

Decilla and Gyaon. Probably early designs of Tyranitar. Decilla is the substitute movement dummy, it was meant to be a pokémon. I wish it had existed.

10 38

A deer pokémon was planned to be in the first generation. It seems like an early version of Stantler.

8 54

Beta Gyarados. A very drastic change in his design, Is like a mix between a worm and dragon. Very strange design...

7 34

Beta Scyther. A very drastic change to his final design, it's more like a dinosaur with aspects of a mantis.

4 25

Haneko, Poponeko and Wataneko (Hoppip, Skiploom, Jumpluff). This is the evolutive line from beta version hoppip.

5 22

Tsuinzu. This pokemon was planned to be a Girafarig pre-evolution. However, I don't see the logic of a double ghost evolving into a giraffe.

4 19