Looking into some builds online I perceived that some people have two or three ability scores at 8, even if this cannot be explained by the Ancestry Flaw.
Is there any way to exchange Ability Scores (as in Pathfinder 1e, where you could do stuff like -1 Dex/+1 Int as you wish)?
When written, Patta's answer was correct. There was previously a rule that allowed a player to decrease two stats in order in increase a third. However, as of approximately January 2023, that rule has been removed. Indeed, the link in Patta's answer now shows the updated text. (Reposting for ease of use: Character Creation, Step 6 (Archives of Nethys))
Optional: Voluntary Flaws
Sometimes, it’s fun to play a character with a major flaw regardless of your ancestry. You can elect to take additional ability flaws when applying the ability boosts and ability flaws from your ancestry. This is purely for roleplaying a highly flawed character, and you should consult with the rest of your group if you plan to do this! You can’t apply more than one flaw to any single ability score.
You may still choose to take an optional flaw, but as-written, you no longer have the option to boost a different ability score as a result of the flaw.
There is an option detailed in the "Character Creation" Chapter of the rulebook called "Voluntary Flaws". This can be found in a sidebar on page 26 of the basic rules and allows a player to pick 2 additional flaws for their character to get an additional free ability boost.
Sometimes, it’s fun to play a character with a major flaw even if you’re not playing an ancestry that imposes one. You can elect to take two additional ability flaws when applying the ability boosts and ability flaws from your ancestry. If you do, you can also apply one additional free ability boost.
For the full rules, including special restrictions for the flaws and boost, see Character Creation, Step 6 (Archives of Nethys)
