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You've been chosen to help out with the next Pokemon game. HMs are officially kill forever, and you need to select which Pokemon are going to be rideable to take their place in the newest game. You're not given any details about the region though, so assume any/all previous HMs or items are in play.
So which Pokemon would you choose to replace what function? Feel free to elaborate.
Hard Mode: No Legends, No Starters
Extra Credit: Think up a completely new hazard or obstruction and give it a unique ride pokemon.