Done Gen 4: Explosion ignoring Burn

Dorron

BLU LOBSTAH
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What type of bug are you reporting? Mechanics

What is the bug?
Ingame in Gen 4, when a burned Pokemon uses Explosion, it's BP is reduced to half, as usual. However, this replay shows otherwise as 252+ Atk burned Metagross Explosion vs. 0 HP / 0 Def Tyranitar: 141-167 (41.3 - 48.9%) -- guaranteed 3HKO (no item makes 49% go to 87.5%)

I didn't know if it was either a calc bug (Explosion ignores burn but the calc doesn't) or a mechanics bug (PS ignores burn when the calc doesn't), so I tested it both in Platinum and HeartGold. In both scenarios, I used a 31 Atk IVs 0 EVs Gengar and faced Gravelers in Victory Road. Both the Gengars and the Gravelers were at the exact level in which I could ensure that the healthy Gengar would always OHKO Graveler, while a burned Gengar would never OHKO it. Both burned Gengars failed to OHKO the Graveler, thus proving that it's a mechanics bug.

Proof that even the weakest Graveler survives burned Explosion: Lvl 67 0 Atk burned Gengar Explosion vs. Lvl 40 0 HP 0 IVs / 0- Def 0 IVs Graveler: 78-92 (82.9 - 97.8%) -- guaranteed 2HKO
Proof that even the best Graveler dies to healthy Explosion: Lvl 67 0 Atk Gengar Explosion vs. Lvl 40 0 HP / 0+ Def Graveler: 113-133 (106.6 - 125.4%) -- guaranteed OHKO


Same calc in HGSS levels.
Lvl 53 0 Atk burned Gengar Explosion vs. Lvl 32 0 HP 0 IVs / 0- Def 0 IVs Graveler: 63-74 (81.8 - 96.1%) -- guaranteed 2HKO
Lvl 53 0 Atk Gengar Explosion vs. Lvl 32 0 HP / 0+ Def Graveler: 92-108 (105.7 - 124.1%) -- guaranteed OHKO

Here are the videos for proof if needed.

Are you able to replicate it? If so, how?
https://replay.pokemonshowdown.com/gen4ou-2319851870-fc9tuqxlcihv7vmm2feckeb9vkaduyspw


There's also https://www.smogon.com/forums/threads/burn-explosion-glitch.85566/ from 2011
 
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