Legality Checker Error (Gen 3 - RS)

[ecrs98]

The problem The legality checker erroneously flags a legal PID/ability combination of the following Pokemon in a blank RS save file.

For reproducibility 0251 - Celebi_JP - 8CC8AB87D82B.zip

Expected behavior Given the PID AB87D82B, I expect the ability to be Natural Cure (2). However, the legality checker flags this PID/ability combo with the message "Invalid: Ability does not match ability number." Keeping the same PID and changing the ability to Natural Cure (1) returns a "Legal!" message.

Converting the PID AB87D82B to binary yields 10101011100001111101100000101011. The last bit in this number is 1, so the Pokemon should have its second ability.

Additional context I am matching a genned Celebi to a legitimate Ageto Celebi from the JP Colosseum Bonus Disc, in accordance with the retail RNG guide contained in this Reddit post. The Celebi I am matching is described in the second row of data in the screenshot below, displaying the correct PID and ability -- AB87D82B and 特性2 (Ability 2), respectively.

[Lusamine]

This seed shows up in both PokeFinder and RNGReporter as Ability 1 which doesn't matches what PKHeX expects. Ideally, the issues should be for legitimate Pokémon that are being flagged, not for asking why genned Pokémon are being flagged.

EDIT: I forgot that both of these programs use Ability 0 or 1 rather than 1 or 2, so 1 would match up to the 2nd ability. But I'm unsure if there's something else to that Pokémon such that all of them end up as Ability 1 after transferring to RS, for example.

[ecrs98]

Understood, thank you.

[Lusamine]

Made an edit to my earlier comment once I realized the programs index ability differently.

I also noticed that the 111 Ageto Celebi examples provided on PPORG are all Ability 1.

I'll leave this issue open for someone else to explain what we are observing.

[kwsch]

In generation 3, Pokemon without distinct second abilities have their second ability as 0, and the game will not set the ability bitflag. Thus, it will only select the first slot.

[Real96]

This seed shows up in both PokeFinder and RNGReporter as Ability 1 which doesn't matches what PKHeX expects. Ideally, the issues should be for legitimate Pokémon that are being flagged, not for asking why genned Pokémon are being flagged.

EDIT: I forgot that both of these programs use Ability 0 or 1 rather than 1 or 2, so 1 would match up to the 2nd ability. But I'm unsure if there's something else to that Pokémon such that all of them end up as Ability 1 after transferring to RS, for example.

Just wanted to point out that PokeFinder correctly calculates Celebi as ability 0 only. You have to use latest release/commit for this.