I used to draw a bunch of fakemon when I was younger...some of the genIII and genIV pokemon actually resemble my older ideas conceptually speaking. :P
Anyways, a few of my ideas that don't yet have a similar-concept real pokemon are:
-A Flying/Fighting emu pokemon that wears boxing gloves.
-a psychic-type praerie dog-gopher thing with one large hypnotic eye.
-a ghost pokemon resembling the old hokey white-sheet ghosts...it would evolve into a similar-looking sheet ghost, but with fangs and glowing eyes. :P
-a fighting/steel evolution of Primeape with metallic cyborg enhancements...I called him Oreilla. :D
-a psychic/fighting indeterminately shaped pkemon holding a hand of playing cards with a cigar in its mouth.
Yeah, that last one is weird, but the rest are okay...