What are the exact details and mechanics of the speed loss upon getting t-waved. Is it that your speed is cut in half? Is it that you're moving last in the priority bracket? Something else? TY for answering
When a Pokemon is paralyzed it's speed is brought down to 25% of it's previous speed, unless the Pokemon has the quick feet ability in which case it gets a speed increase of 50%, and no speed loss is incurred.
More info: http://bulbapedia.bulbagarden.net/wiki/Paralysis_(status_condition)
Your Speed stat is slash by 75%. You have a 25% chance of not being able to move.