At least ORAS had some great moments (encountering Kyogre, the Deoxys battle) and Zinnia's theme is fantastic, none of the other 3DS games have anything apart from the Tapu battle theme and maybe Guzma and Lusamine's battle themes.
Also Gens 6 and 7 do have the occasional great design, like Xerneas or Greninja or Tapu Koko or Mimikyu or Talonflame, but Gen 7 especially have way too many gimmicky shitmons. Not that new Pokemon makes a difference to the quality of a game in the long run.