>>15015269>Fire/WaterBased on tube worms - those weird red and white worms that live in the superheated vents deep in the ocean. Pic related.
>Ghost/RockIts first stage could start as a tombstone pokemon - kind of like diglett but more sinister. It could evolve into a "stonehenge" kind of thing, a ruined tomb, or a haunted obelisk.
>Steel/PoisonA nuclear reactor pokemon - its first form would be a vat of radioactive waste, and it'd eventually evolve into a smoking cooling tower.
>Fire/GrassBeen posted before a couple times, but a chili pepper based pokemon really seems to me to be the best way to do this.
>Fairy/GhostBanshee pokemon. A creepy and dark counterpart to gardevoir. Would have a number of sound based attacks in its movepool, and some kind of sound related ability.
>Ice/SteelA diamond pokemon - eventually evolves into a comet.