You see, I never bought into that. To me, Pokemon has always been about teamwork and bonding with your companion. First of all, trainers don't make the pokemons fight to the death. They know when to stop, they know when a pokemon had enough. They treat them appropriately, feed them, take care of them, connect with them. It's a sports thing, and trainers can choose whether to take part in it or not. It's when a trainer pushes a pokemon too far that it becomes abuse. Yeah, they catch them against their will, but is it not the same as, say, taming a wild horse or some other wild animal? Something humans have been doing since the beginning of time? Also, if that were the case, why do the pokemon look happy? They should look miserable, but a lot of them look content and glad to be with their trainer.
Yes, pokemon has shown many times that they are intelligent. I mean, they can clearly understand the human language, and at times in the show can teach themselves to speak it, and with what you're saying is the case then with their power they could easily take over the world and eradicate the human race. Yeah, human's have pokeballs, but as mentioned above, pokemons can easily break out whenever they want. They're not an effective enough tool for imprisoning pokemon. Why do you think Team Rocket used so many various traps instead of just using a simple pokeball to catch them? We've seen several pokemon that have enormous ammount of power, so why haven't they done it already? Because they need the trainers just as much as trainers need them. It's a "I scratch your back, you scratch mine" type of thing. You noticed how wild pokemon tend to be weaker than trained ones. A Pokemon needs a trainer to become stronger, which is all a pokemon has for itself, really. And when a trainer is recognized for his skill, he's being recognized for his ability to command, lead, take charge, come up with tactics, taking care of his friends and allies, working together, and teach them to become more than what they are. So when parents are sending their kids to catch pokemon, it's teaching them several lessons to take in life, or in the universe that the series takes place in (also note that this takes place in a world far different than our own). It's like the relationship between a commander and a soldier, or a director and an actor. One cannot realize its full potential without the other.