We don't know exactly what a "Master" is in the anime so you can't say being an E4 member equals to being a master.
Heck if that's true does that make Ash a master for beating them should he fight them later on?
It obviously an elite trainer that specializes in Water Pokemon, and that’s definitely not a gym leader. If it were that easy Misty would have never left the gym to start with. And she worshipped Prima.
What do you do in the game? You beat the Elite Four and the Champion. Pokemon Master has to be at least the same level of Champion or higher. And if doing well in the leagues doesn’t apply then why is Ash competing in the leagues? Because if it was about catching a lot of Pokemon or doing something else Ash would be doing that instead. He competes in gyms and leagues, so that obviously has something to do with it. And if he battled the Elite Four and the Champion, he obviously would want to win so I don’t see how Pokemon Master is anything less than Champion, it’s probably more than that. He would probably need to compete in that Champions League that Lucian talked about. To be a Master he would at least need to beat the other Chapions.
Water Pokemon Master means your one of the best trainers with Water types. And some of the strongest type specialty trainers we know of are apart of the Elite Four. I don’t see how you can be a master of any type if you’re not at least at their abilities as trainers. To be honest Master is better than the Elite Four. But it is a minimum of power and skill one should at least have to even be considered a Master, that’s why I made the comparison.
Not necessarly, look at how well brock's pokemon were doing in the BF, Gym leaders aren't forbidden from toughening up thier pokemon and remember stategy is half of the battle.
His Onix evolved after it already had a ton of experience and that’s it, big whoop. And Brock is a terrible example of that point himself, because being a gym leader was preventing him from accomplishing anything. He could have been a Breeder there, but no he HAD to travel. And you can’t tell me that Breeder is more difficult than Master, that you have to travel to be a better breeder like Brock did and all you have to do is stay in one place to be a Master. And nearly all of Brock’s new more powerful Pokemon he got travling. The anime has rammed it down our throats that you have to travel to get better.
Not Really, Ash still fights rookies from time to time and his skill still goes up.
He has more access to experienced trainers than Misty does. If he hears about a competition or a great trainer he can just go there, Misty can’t. She has to take whatever walks though the door and the vast majority of them are not that experienced. Beating up on rookies does not help you get better, it’s batting the ones at your level or better that helps you improve. And she simply doesn’t have the same opportunities that Ash has.
The hoso's and Battle frontier pretty much proved it's easy to have pokemon migrate from region to region, therefore they could have her get anything close to where she is if they want to without having her leave the region.
And who going to watch the Gym while she does this? Her sisters can’t take care of it long enough for her to go to Professor Oak’s. Being stuck at the Gym means she can’t even travel around locally without someone watching it. The only real Pokemon she has the most access to are the ones at her local Pokemon Center or when she occasionally visits Oak. She simply doesn’t have the time to try and go out to build up her team. That’s why her only new Pokemon since Gyrados were weak ones that were given to her.
You have to take into account though Sakura was still a rookie at the time, she knew what to expect when she had the rematch with Misty, especially since she used the very same pokemon she used the first time(Corsola), If she had used something different things might have turned out differently, plus again strategy is half the of the battle, look at Ash for crying out loud, he does that all the time, Roark and Gardenia being more recent examples of that.
And how did Sakura stop being a rookie? And that doesn’t mean that Ash isn’t better than he was when he started. Unless your suggesting he could have become a good trainer by staying in Pallet Town.
Once again, what it takes to "be a master" has not yet been defined in the anime so how can you say being an e4= master?
Master is probably better than E4. It’s a minimum comparison of power. Unless you’re saying that a Master is weaker than the E4.
Well she seems to be enjoying herself there, and with all the development put towards it I don't see her leaving it either.
Then why didn’t she stay there in the beginning? The writers could make them enjoy anything for the plot even if it’s OOC. They could make Brock give up being a Breeder, and become a gym leader again as well taking care of his brothers and sisters all by himself again and have him enjoy it. They could have Ash abandon his journey and have him enjoy it. They have Misty enjoy it because it’s convenient for the plot. If she enjoyed it in the first place she wouldn’t have left and she wouldn’t have been upset about having to go back, in fact she should have been happy.