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Treasure Hunting ** for bottle cap farming.
Dye shops, just never hope to get anything other than pastel colors before post-game.
Friendship cafe might be useful before you farm enough EV berries.
But overall, everything about it is a messy grindy chore with more luck involved than winning the fucking lottery and an unbelievable amount convoluted abuse required to get things that should be availiable pretty much from the get go.
That's why I named mine Despair Kingdom
Festival Plaza, SOS battles and edgy pokédex are the three things that I'll be happy to leave behind when we abandon Alola.