Just like Blue Kaizo & Crystal Kaizo, just about everything in the game, including the wild Pokémon, the teams of trainers and gym leaders, and even the layouts, has been changed to make the game a much more difficult experience than vanilla Emerald.
You can obtain all 386 Pokémon in the game, although just like in vanilla Emerald, some are reserved for the post game only, such as Groudon, Kyogre, Rayquaza, and more, after meeting certain criteria.
The Gym Leaders have boss rematch fights, but when searching for Groudon and Kyogre, there is one boss fight before them that you must engage in.
Great quality and awesome service
Wanted to play this on my ds lite like an actual Pokémon game and this was a cool way to get a cartridge with emerald kaizo on it in a nice ds case with artwork for the game! Very pleased with this product and very quick shipping! Thank you