DRAGON QUEST XI S: Echoes of an Elusive Age - Definitive Edition

Another way is when you exit Hotto and start the "Oh, for the Rainbough" chapter, you can switch the game to 2D at the Priest next to the exit, then collect 5 mini medals on the way to Gallopolis (and also plenty of money, pearls, gear you can sell and 1 Seed of Skill), change back to 3D in Gallopolis, which will take you back to Hotto at the beginning of the chapter (while keeping everything you earned and collected), then rinse and repeat. It's a well known trick; it's everywhere.

Do this while popping Holy Waters on the way (2 per run if you're fast, 3 otherwise) not to encounter any monsters (if you're level 15 or above), and you will have collected 110 mini medals, 200 Perfectionists Pearls, and made over 100000G in 2 to 3 hours. Not saying it's an amazing trick, but it gives a lot of money early, plenty of pearls to rework your gear, and over 20 Seeds of Skill. Plus, you won't have to worry about farming mini medals at the end of the game.

The run I did was this (in broad strokes) :

Start in Hotto in 3D at the Priest (you can safely overwrite your save file every time, all you have to do is spam A)

Behind bottom right house > 500G
Behind left house chest > mini medal and 100G
Miko’s temple chest > 5 pearls

Go back to the Priest and switch to 2D (overwrite your file)

Down the well > fishnet stockings
Chest left of pub > 2 chunks of gold ore (if you did the guy's quest)
Inside bottom left house dressers > mini medal and 100G
Barrels left of item shop > lamplight and copper ore
Miko’s temple chest (inside this time) > 5 pearls

Exit to the open world, and travel left towards Gallopolis, popping Holy Waters every 30 sec when you get the MSG on screen that their effect has stopped. Again, be level 15 or above for this to work.

East clearing before the gate (looks like a little light colored square on the map) > copper, mini medal and glass frit
South east clearing after the gate > 2 gold, 1 iron, witherwood, beast bone, mini medal

Enter Gallopolis

Church dresser > traveler’s hood
House above, right dresser > wayfarer’s clothes
House above (stables), dresser > seed of skill
Top left house chest > mini medal
Inn top floor > turban (if you want)

Go to Sultan Palace

Palace right room > feathered cap, iron broadsword
Palace left room > fishnet stockings, 1500G, concrete earrings (sell for a ton of G)

Go back down to the Church, switch to 3D, you will be teleported back in Hotto at the beginning of the chapter while keeping all your stuff. Collect again the first 3 bullet points, switch to 2D, rinse and repeat until you're tired of it. Watch a podcast or some TV while doing this.

You need 75 for the achievement 110 is for the forth page