Hello, I've never posted here, but I thought I'd give it a shot and recommend a move that I believe should be added to one of Gyarados' Analysis sets.
Here is Gyarados' Analysis page for reference
The set I would like to add a move to is the "BulkyGyara" set.
Currently, the recommendation is as follows:
~Dragon Dance
~Taunt
~Waterfall
~Return/Bounce
Now, when I was considering using Gyarados on my current team, I really liked this set a lot, and was enthralled at the type coverage Water/Normal gives. However, I usually like my moves to do something, especially when I'm sure that they won't KO the target, which was why I was really starting to dislike Return. Bounce, to me, is not a very good option, however, I respect that some people will disagree with me, but I still think it deserves a mention on the set; I just don't like it myself due to the low PP and ease of countering due to the charge up turn. Not to mention, you get walled by any Pokémon with Protect.
I decided to look for a 4th move myself and think I have found a move that combines the two moves into one, the normal type coverage, and the chance of paralysis that Bounce gives that works so well with Waterfall. That move is:
Body Slam. Body Slam, learned by move tutor in FR/LG/XD, has 17 less base power than Return, but has a 30% chance of inflicting paralysis.
Here are some damage calculations to illustrate how the slight loss of base power is negligible after some Dragon Dances:
+2 Gyarados, BulkyGyara EV's with Body Slam vs. Defensive CM Latias: 56.5-66.7%
+2 Gyarados, BulkyGyara EV's with Return vs. Defensive CM Latias: 67.9-79.9%
Both 2HKO Latias even with Leftovers (though if you roll minimum damage twice with Body Slam, you're cutting it a little close xP). The other benefit is the chance of paralysis on switch ins. A Salamence or opposing Gyarados won't like getting paralysed and either switch out again, or try to match you in the DD race.
Hopefully this post is sufficient. If needed, I can add more damage calculations, I just cannot think of what would be wanted in that respect. Thanks for reading.