Simply hovering over Charizard's icon would freeze the CSS (I have the individual Pokemon & Alloy CSS). All I did was make a Charizard texture.
Also, should I get the Homebrew Channel Update? Last time I got it, I remember it causing a problem...
If you have no trouble with HBC, don't update.
Do you have any custom CSP for Pokemon trainer installed?
Well, I just made one a couple days ago, but Charizard's been freezing since before then.
EDIT: 100th post! :af:
Your Charizard folder is probably corrupted. This happened to me with Wario and I had to delete his entire folder and re-download everything. Yes, even though it froze at the CSS it had nothing to do with any CSPs or anything. If you've added anything to his folder before it started freezing try removing that and seeing if you still have problems, otherwise you may need to start his folder over.