Are there any items that Decrese your speed,making you fastEr in a trick room
The Power Items, The Macho brace, and The Iron ball are the Items that Decrease speed.
Note: The Lagging tail does NOT decrease the speed stat it makes you move last which would still be last in T-room.
In gen 8, an item called Room Service was introduced. It only activated in Trick Room, and lowers Speed.