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>Perfect the Pokédex
If you mean literally get a "Perfect!" rating for completing every single task for all Pokémon, then maybe. But that's something only someone would do if Nintendo had Sony's Platinum Trophy system, or they wanted absolute minimum shiny odds should they want to hunt in PLA long-term.
Completing the Pokédex (i.e. get everything and throw hands with arse) is only a sickler in a couple spots like Wyrdeer (prior to daybreak), Enamorus, Spiritomb and the Mythicals (Manaphy and Phione because obscure BDSP knowledge, Darkrai and Shaymin because alternate save data). Catching one of everything is absurdly smooth sailing and, even when just completing the 'main' storyline and beating the respective origin forme > credits, is encouraged ever since getting the early trio as a tutorial.
Even filling the dex/getting the shiny charm (getting 10 points in all entries, completing said entry) is easy peasy since you have x2 for at least 2 tasks for anything not legendary, one of which being guaranteed to be total captures.
It's amazing, one of the best implementations the game as to offer. Getting more info as you go along, such as what food/cake bait works best, is also a great touch. Doubt Z-A will have it anyway since Lumiose, even in its 1800s reformity, is no doubt more advanced than Jubilife Village.
