DemICE

This is regards to both Reborn and Hardcore, but you're making a very big assumption saying a game where Rock Climb shouldn't be an HM has climable walls all over the place. It's probably easier for them to just add 2 TMs to the list rather than redoing the entire TM system in order to be 100% correct. They can easily be added back worse comes to worse (the hard/tedious part is defining all of the moves for every Pokemon)

That would actually be best indeed