I think I missed all the events.

In that case, what's the point in playing at all?

I should state that I mean using a GameShark to unlock an event to get said Pokemon, not just adding the Pokemon to the game.

However, these events aren't "playing" anything at all. All you're doing is getting these little "official" downloads during events that only last so long. And if you don't take part in the event than your Pokedex is forever screwed over without a trade from someone.