What super basic, straightforward ideas haven't found their way into Pokémon yet?

I know literally my mom's X designs aren't very inspired, but the reason I'm asking is because stuff like this is a practical guarantee given enough new Generations over time. I want to know what we can expect in the highly likely future.

>electric type cheetah
>dark type snake
>dark type spider
>dark type bat
>psychic type peacock
>fairy type fairy armadillo