Hello! I believe there is a discrepancy between damage calculator in /calc page and actual showdown play damage for generation 3 games. Below is the link to replay to which I will refer.
https://replay.pokemonshowdown.com/gen3customgame-1374657737-mykrrmjjv5tllm7bb62y471zwo4pvwfpw
In this game, Latios is EVed to live a shadow ball from any deoxys-attack that is not holding a choice band. The exact EVs of latios can be seen at the end of replay through !showteam function. Deoxys-attack is holding spell tag, which should boost ghost moves by 10%. Here is what the damage calculator shows:
252+ Atk Spell Tag Deoxys-Attack Shadow Ball vs. 244 HP / 48 Def Latios: 306-360 (84.5 - 99.4%) -- guaranteed 2HKO
However, in turn 8 and turn 13 of this replay, it is showing that there is a chance for 100% damage on latios. Would you kindly review this calculation, please? As always, thank you for keeping this amazing website running!