>>311789346) Treasure Hunt 2-stars (specifically this lottery and specifically that ranking) will for some reason always give you a Bottle Cap every time you get one new in your plaza. This means you can simply find somebody who is offering this facility, save them as VIP, buy it off them for 100 FC, and then you collect your Bottle Cap. Replace it with the facility you get from levelling up, then buy Treasure Hunt 2-stars to replace it for another guaranteed Bottle Cap. 100 FC = 1 bottle cap, well worth it.
7) The Fortune Teller Buff "Good Luck in lottery shop" can be combined with 5-star Treasure Hunts to also farm Bottle Caps or Gold Bottle Caps. This is because the game will roll your Lottery reward at the beginning of the day, but the rolls for extra rewards triggered by a Fortune Tent are randomised there and then. You can therefore savescum to change the additional rolls. Technically this works with all stars of lottery but 5-stars give you the best odds of a high reward so it will take less resets to get a desired result. Sort of a situational tip, though - it's easier and more reliable to farm 6 Bottle Caps through the exploit.
8) Missions are mostly pointless after you've grinded enough to get Fortune Teller tents, though they're still useful for adjusting your FC to a specific amount, and if they're new they're pretty much the best way to get off the ground. Inverse Type Matchup is easily the best mode giving you 6 FC per star, whilst regular type matchup gives you a clean 5 FC per star making it easy to control. Always do missions online if you're farming, and do them offline if you're trying to savescum the facility Sophocles gives you.
9) With Two Rare Kitchens 5-star, you can level up any pokemon from Level 66 to 98 in a single day. You then only need two rare candies to boost it to level 100 and it can then by hypertrained. You won't miss Blissey Bases as much when it's this easy.