Because Satoshi Tajiri and Gamefreak have a sense of humor.
Another reason because that is the most unique stat that any pokemon has and shedinja is the only pokemon with only one hp and such that it cant increase no matter what.
How to change your username How to add a user avatar Why was my post hidden? The points system Question etiquette Flags vs Downvotes Anime FAQ
Type a Pokemon name, type, move or ability to see instant results.