Fun fact: The newest titles in the main series, Omega Ruby and Alpha Sapphire actually decided to increase the number of moves required for you to have a pleasant and open playthrough of the game. To navigate the world properly you're going to need not one, but two slaves, both with 4/4 moves that a dictated by what's needed rather than what you want.
As far as trading up Pokémon though, you can actually transfer a Pokémon from the original first game all the way up to the newest if you do it properly - It is however a rather complicated and strange process that'll like be too bothersome for anyone to go ahead and tinker with unless you're really desperate to have your old Pokémon brought with you for some reason. I don't really see how that is disappointing though - Honestly it's just to be expected. When a game goes through generations, and even jumps from new console to console, you can hardly expect them to keep everything compatible all the way through.
Are there any new HM's though? Depends on what you'd consider new to be honest. Not sliding on icy paths is a somewhat poor example, because most icy floors exist solely as part of puzzles, and yet, even to this day, in a world of 3D, the puzzles are basically the exact same as they've always been. You've got your 'Push a rock around' puzzles and your 'Slide in the right direction' puzzles, and a few other familiar faces. But no, nothing is particularly fresh about the HM's. Same old.
That being said, X/Y are (Warning: Opinion) probably the best Pokémon games to ever be released - In stark contrast to Omega Ruby/Alpha Sapphire that are easily the greatest and most disappointing and infuriating waste of time I've seen in a very long time.
'But Nachtmahr, ORAS can do all the same things as X/Y!' No! They've tried to shamelessly just copy-paste every interesting feature from X/Y, and yet they couldn't even get their copy-paste right and managed to direly mess up things that should be so simple!
There's a lot of water in ORAS, and some might already be itching to jump at me and lecture me on how the games take place on a bunch of tiny islands - Well, the water isn't my problem.. My problem is that being stuck in an environment that looks exactly the same, blue and bland, for hours and hours just isn't fun whether it's the sea or the moon. The games lack any kind of diversity, going from 'Forest' to 'Caves' to 'Water' and that's it.
The 3D graphics doesn't really do anything in ORAS favor either as it's very obvious to see that the game itself wasn't originally built around the idea. Where X/Y is full of beautiful vistas and structures to behold, ORAS looks bland from just about any angle you can imagine with it's towns consisting mostly of two houses and a Pokémon center and boring scenery.
Another shortcoming of ORAS is the fact that it completely falls behind when it comes to diversity in encounters - Every badguy you fight feels the same, and either faction, be it Team Aqua or Magma are limited to a pool of just 4 Pokémon, and eventually their evolutions - Except for their trademark Pokémon which apparently only the leader is allowed to evolve.
There are so many things wrong with Omega Ruby/Alpha Sapphire that it would be too much to just list here, but my god.. If you love them, good on you - I don't get it, but good on you. I tried, and I tried hard.. However, whatever I did the game insisted on finding new and creative ways of just completely wasting my time as a player and loyal fan, while spoon-feeding me sub-par content.