Where pins are
Pins are not a separate drop you hunt on the map. Open the charms tab in the equipment menu, pick a slot, and use the pin control at the bottom of that slot. The next spin rerolls the slots that are not pinned. Locking more slots changes the reroll cost, so check the price before you lock two slots on a small Yen balance.
What to lock
Season 5 charm guides sort the effects roughly like this. The percentages are from those guides, not from an official stat sheet:
| Rarity | Reported boost | What to do |
|---|---|---|
| S | about 15% to 20% | Pin it |
| A | about 10% to 14% | Pin it if it matches the racket |
| B | about 5% to 9% | Reroll unless you are still on a starter racket |
| C | about 1% to 4% | Reroll |
The three effects those guides tell you to keep are Dash, Smash, and Double Dash. Dash helps you reach a save. Smash adds pace to the downward hit. Double Dash is an extra short dash for a correction in the air. A defensive build pins dash, then double dash. An aggressive build pins smash, then dash.
Do not spend the whole bank perfecting charms on a racket you are about to replace. Soul Smash, Neon Chaos, and Divinity Hunter are the rackets those guides say are worth a finished charm set. Soul Smash is tied to banner reports. Divinity Hunter is the ranked reward for Divinity rank plus at least 130 wins.
Shuttles, explosions, and racket skins are cosmetics or trade items. They do not replace the charm slots on the racket you play with.