Pokemon evolution games

I'm planning on making a pokemon game similar to jwe2 where you capture pokemon and put them into zoos or nature reserves,the game will have between 200 or 400 different type of pokemon and fakeomons, the creatures will look as if they are real natural creatures, could I don't that?

 

It seams like a hard work. If its 2d reuse sprites and change the color palet if its 3d combine different models and textures
(So 20 models and 20 textures for examle will be 20 * 20 = 400 pokemons)

 

Blue/red was my first and most favourite game with Pokemon Radical Red cheats. When I was helping my little cousins with their game (a new generation of Pokemon fans), I tried gold/pearl and some of the newer ones, but blue will always be number one for me.