Meh. Some problems here, but not bad.
First of all, Gayermon 2 isn't a very good name.
Second of all, the Pokemon saga is different at times.
You see, in Red, Blue, Yellow and Green, they were in Kanto, got 8 badges, caught Pokemon, fought TR etc.
In Gold, Silver and Crystal they went to a new land and had 251 Pokemon, a day/night feature, and these weird plants called Apricorn that would heal your Pokemon and create Pokeballs.
In Ruby, Sapphire and Emerald they went to a new land and had 386 Pokemon, could not trade with the other games, had a new evil team (two actually), and Pokeblocks that you could mix up and enhance your Pokemon's skills. Also there were now 2 vs. 2 battles.