When Brock first left for...- well, let's not mention the name for Brock's sake, LOL- and Tracey came on board, it was definitely not something the fans were prepared for, and Tracey ended up getting a raw deal, but now that the sidekicks coming and going has been a regular thing since Hoenn I don't think it's that big a deal. I like seeing what the new characters have to offer the show and Ash. I miss Brock, but his successors have been good in their own rights (Tracey included), and Misty's have been great too. Not all companions have been great, but I still enjoy them.