Question

Is Lagging Tail or Iron Ball better for halving Speed?

Answer 1

If you want to actually lower your Speed, use Iron Ball. Lagging Tail doesn't actually lower the speed stat, it just makes you move last. Iron Ball meanwhile lowers Speed by 50%. Also, if this is for a Trick Metagross, Iron Ball has the added effect of removing resistance to ground of Flying types and Levitators, allowing Earthquake to hit these guys.

Comments

GREAT, TRACHY!

Answer 2

Personally, I find that the Iron Ball is better, but you may also want to consider a Macho Brace as a third possibility.