Don't someone ever sought that Fern is just like Blue? As for me, they are very similiar. Blue always wanted to be one step further than protagonist, he always wanted to be at the top, and never blamed himself, he blamed others (" No way! I have picked wrong pokemon!" For example)
And Fern is just like him. He want to be "top dog", he want to impress his sister, Florinia, he want to prove to everyone that he is strong and he never blames himself. Thats my opinion.