Hello I'm new the forum but I came across a potentially scientific moment that might be of use to people trying to "figure out" the Battle Arena. This quirk specifically affects the "Body" category as I was shocked to win this even after doing all the calcs. Hopefully this is useful to someone. Pardon the cell phone video of my DS, I don't have a capture card.
TLDR:
For the Body category, it would seem that your health ratios are determined the moment either player sends out their pokemon and they are face to face. Even before the ref says "Commence battling!" therefore you can sneak an extra turn of leftovers heal (8% HP) the turn your opponent sends in a pokemon, if you just KO'ed their last pokemon and are not 100% HP. This "Leftovers Overfill" is potentially useful if you could somehow rig your HP to be very low the turn something comes in, as your HP ratio can be greatly impacted by even a small heal like leftovers close to 1HP.
WHAT HAPPENED:
My Kingdra wins Body category in the above and I wasn't sure how. Delayed hit moves Dive/Fly/Dig etc. have already been shown to be very good at the Mind/Skill categories so I stalled and avoided crits from potential Scope Lens Feraligator 3/4 with Dive but I expected to tie overall (Δ O X). Yet after winning (Δ O O), I think there's a quirk with the Body category starting the HP ratio when the two first meet instead of when the referee says "Commence battling"
Per Bulbapedia:
- Body judges the amount of HP remaining at the end of the third round compared to their amount at the start of the first. The Pokémon with the better ratio wins the two points in the overall judgment.
- My Kingdra has 85/175 (48% HP) when the referee says "Commence battling."
- His Earthquake deals 52 dmg*. With Leftovers I finish the fight at 63/175 (36%) HP. My ratio of dmg taken is 63/85. I have ~74.1% HP
- My Dive from my Modest 252/31 SpA EV/IV Kingdra does between 14.9% - 17.7% (27-32 dmg of 181 HP) to the 31 IVs Feraligator 3/4 who have identical stats. He has (if I hit max) 149/181 left or ~82.3% HP
If I account for the moment Feraligator is sent out (~21 seconds) before I get the leftovers heal and the ref says "Commence Battling!" I have 75/175 HP. Now the ratio becomes in my favor 63/75 = 84% of my health remaining.
This was Match 7 of Round 5. From what I can find, his Pokemon are now close to 31 IVs. It doesn't matter though, I ran the calcs against a 0 IVs Feraligator 3/4. He can hit me for 52 still, and if I max hit him for 37 that turn he still lives with 129/166 or 77% HP which is still more that my original value of 74.1% HP.My Kingdra btw (https://pokepast.es/636532a490ddf7a3)
***Perhaps there lies a strategy with being very low HP where leftovers or another heal could provide you with a significant HP overfill (in terms of ratio when the two pokemon meet) to almost always win Body especially combined with any 2 turn attack move like Dive.***EDIT:
P.S. if there is a more specific forum on Emerald Battle Arena pls move this there
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