Because the whole premise of Call of Duty is pick up gun, shoot moving targets, repeat. Pokemon adds at least 100 or so new monsters with each generation coupled with new moves, a new environment that's filled with areas that you can't access unless you strategically give your pokemon a certain move, and you have to form a formidable team with a different group of pokemon you know nothing about. Couple these facts with the individual abilities of each pokemon, each pokemon's moveset limitations, and each pokemon's stat sets and you have a lot of information that you have to consider when building a team that will work effectively. You also have status conditions, legendary pokemon that may actually present a challenge when trying to acquire, and even some hidden story or event to lead to the legendary pokemon that you have to figure out how to even get to before you can obtain. You have to think and plan ahead on what can and will work between only 6 pokemon so that you will succeed. With COD, like I said, pick up your gun, shoot everything, reload, repeat. It's fun with friends but it's boring to me otherwise and I will usually not play unless my friends are online.