It includes all the Pokemon up to Gen 6 and there are 1349 Pokemon available in this game. You need to look at every details while playing this new game because even hidden or secret places has something important for you to see and pick up.
You get to play as red hair instead of blue hair (normal Pokemon game). The Game play includes all of Gen 1-6 Pokemon in Omega Ruby Randomizer ROM without any restrictions or need for trade evolution. From there you can revive your pokemon and also check how many wild Pokemon are available in the area. Right after entering the Slaeport Harbor there will be a Pokemon with Black Apron, who will give you access to Pokemon Grave Yard. Slateport Harbor is the Pokemon Center where you can heal your Pokemon and also revive Pokemon from Pokemon grave yard. Some New Pokémon includes Giratina, Arceus, Dialga, Palkia, Mewtwo etc. A total of 133 new Pokemon has been added within the game. It is a nice feature to play and enjoy because you get both versions of Pokemon (249 Pokemon) ready in your hand with no special requirement needed. You need to train your Pokemon for evolution basing on Pokemon level up requirements instead of trading it with other Pokemon. All the Trade Evolutions has been removed from Pokemon Omega Ruby Randomizer ROM, which means Pokemon like Chansey and Rhydon are available in the game.