I see your point but I must say that I disagree. Ash said those words because his heart was so broken for leaving Charizard although he knew he had to do it. He just wasn't able to encourage Charizard at the moment and i'm sure you would understand if you would be in a situation like Ash. Ash propably said those words also because he thought that it was the only way Charizard would stay in Chariziric Valley. He was wrong, but he meant absolutely nothing but pure good. And also with his words he wanted to encourage Charizard to fulfill his dream and become stronger than he ever was. And Charizard also knew at least very soon that Ash didn't mean that "Who wants a weak Charizard anyway" and he also new that Ash was heartbroken because he left Charizard. And one of the most important reasons: Sometimes to help people you really care about you have to hurt them. And it shows a real and strong frienship that you hurt your friend to help him. And I'm sure that Charizard knows this as do Ash.
Originally Posted by Calamitу
Welcome back Charizard! I've missed you so much! <3