The main features of Pokémon Zeta/Omicron are:

  • Around 70 hours of gameplay!
A huge sprawling game with incredible amounts of content
  • 2 regions, with a total of 12 gyms and 4 sigil halls!
Beat both the Vesryn region, with its 8 gyms, Elite Four and 4 Sigil Halls and Aroma, with another 4 gyms and the Battle Frontier!
  • A storyline that will draw you in!
Finally a Pokémon game with an actual integrated story!
  • Tons of endgame content!
Go catch legendaries and other exclusive Pokémon and see if you can get them all!
  • A more challenging game!
You want a game more challenging than the original games while not overdoing it? Look no further, Pokemon Zeta/Omicron is everything you want!
  • A new level limit of 120!
Train your Pokémon further than ever before!
  • A functional GTS!
Trade and battle with other persons over the internet!
You enjoyed Shadow Pokemon in Pokémon Colloseum and Pokemon XD: Gale of Darkness? So did we, and now you can enjoy them in Pokemon Zeta and Omicron as well!
Get the Pokémon you know and love, now with different types, similar to Pokemon TCG!
  • All 649 pre-gen V Pokémon, plus some more from gen 6!
Time to really complete that Pokédex!
For when you really want the game to be harder! Enforce your Nuzlockes, randomize every Pokémon, do a run with only one Pokémon, etc.! 
Finally, no more HM slaves needed!
A secret base with many upgrades, such as a mine, a dungeon, rebattle-able gym leaders and much more!
  • Mega Evolutions!
The Mega Evolutions from the original games as well as completely new ones!
  • A way to get Dreamworld and alternate abilities!
Finally get that ability you want!
  • A Battle Frontier
Finally test your limits in this endgame battle zone. Fight with and against the strongest trainers in the game and get exclusive rewards!
  • Viewable IVs and EVs!
The most missed feature in the original games is finally here!
  • A daycare garden
Interact with your Pokémon while they are in the daycare! Watch them while they breed! ಠ_ಠ
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