First, I wanted a rabbit pokemon in Generation 4. It came true instantly! Buneary and Lopunny. However, there should be more rabbit pokemon.
There is Sharpedo, which is a shark pokemon. However, it's small compared to the average shark. The most common breeds of sharks, the skitty sharks, are about 12 feet tall in average, while Sharpedo is only 6 feet tall. Sharpedo needs an evolved form.
Anyways, there are already 8 Pokemon that resemble robots. Magnemite, Magneton, Magnezone, Beldum, Metang, Metagross, Bronzor, and Bronzong. There should be a pokemon that resembles a robot that you see in Sci-Fi movies.
I was thinking of a pokemon that is closely related to Hatsune Miku, but there won't.
A killer whale pokemon would be cool, while Wailord resembles a Blue Whale.
There should be a pokemon that resembles gears. A battery pokemon would be OK.
And anyways, here is an intresting thing I read from Bulbapedia.
Bulbapedia said:
It must be noted that not belonging to an evolutionary family is not indicative of strength, or a lack thereof. Some Pokémon, such as Pinsir and Skarmory, are comparable to fully evolved Pokémon while others, like Luvdisc and Pachirisu, are more comparable to unevolved Pokémon. Often this indicates a Pokémon's possibility to be eligible for future new evolutions or pre-evolutions.
Many people are demanding an evolution of Pachirisu. I agree too, since Pachirisu is already a weak pokemon.