What type of bug are you reporting? Mechanics
What is the bug?
Two incredibly minor old gen bugs involving Chatter and different abilities: in Gen 4, Chatter's confusion chance should not be boosted by Serene Grace (why this is the case I have no idea, but that's how it is on cart), and in Gen 5 Chatter should still be boosted by Sheer Force when used by a Pokemon other than Chatot, even though there is a 0% confusion chance.
Are you able to replicate it? If so, how?
PS! Replay of Serene Grace Chatter (Chatter confused 45/72 times, a realistic outcome given a 62% confusion chance)
Cartridge Footage of Serene Grace Chatter (Chatter confused 10/42 times, a somewhat low but still reasonable outcome given a 31% confusion chance; I can provide the .pcm file if needed to show that this Chatot's chatter did have a 31% chance to confuse)
PS! Replay of Sheer Force Chatter | Cartridge Footage of Sheer Force Chatter
0 SpA Rayquaza Chatter vs. 0 HP / 0 SpD Carnivine: 242-288 (83.7 - 99.6%) -- guaranteed 2HKO
0 SpA Sheer Force Rayquaza Chatter vs. 0 HP / 0 SpD Carnivine: 314-372 (108.6 - 128.7%) -- guaranteed OHKO
What is the bug?
Two incredibly minor old gen bugs involving Chatter and different abilities: in Gen 4, Chatter's confusion chance should not be boosted by Serene Grace (why this is the case I have no idea, but that's how it is on cart), and in Gen 5 Chatter should still be boosted by Sheer Force when used by a Pokemon other than Chatot, even though there is a 0% confusion chance.
Are you able to replicate it? If so, how?
PS! Replay of Serene Grace Chatter (Chatter confused 45/72 times, a realistic outcome given a 62% confusion chance)
Cartridge Footage of Serene Grace Chatter (Chatter confused 10/42 times, a somewhat low but still reasonable outcome given a 31% confusion chance; I can provide the .pcm file if needed to show that this Chatot's chatter did have a 31% chance to confuse)
PS! Replay of Sheer Force Chatter | Cartridge Footage of Sheer Force Chatter
0 SpA Rayquaza Chatter vs. 0 HP / 0 SpD Carnivine: 242-288 (83.7 - 99.6%) -- guaranteed 2HKO
0 SpA Sheer Force Rayquaza Chatter vs. 0 HP / 0 SpD Carnivine: 314-372 (108.6 - 128.7%) -- guaranteed OHKO