Why is Body Slam Leafeon not viable?

Question

Body Slam has a 30% chance of Paralysis, also halving its oppoment's speed. That would mean that Leafeon would outspeed 100 base speed Pokemon. But on the moveset thread, not mich people mentioned Body Slam.

Answer 1

Because it has better moves.
Normal type moves are really only used when they get STAB becuase they don’t beat anything. Leafeon has Swords Dance, X-Scissor, Leech Seed, Leaf Blade, Wish, Curse, Synthesis and other moves that are just better than body slam. The extra effect occurs less than a third of the time, so it’s not the most reliable move ever. If you want speed, use it on a sun team with chlorophyll

Comments

Usually, Knock Off is superior to any Normal Type move and if you do use one, you can heal off Double Edge's recoil with Synthesis unless you use a Choice Band/Scarf set.

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Notice how I said “and other moves”

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I just thought I would elaborate on the most common Normal Type move on Choice Sets and the most common Substitute to a Normal Type move according to Smogon which you didn't mention in your list.  Sorry though.