Similar to his appearance in New Leaf, Pascal will only appear once per day to trade a scallop for a recipe or themed outfit regardless of how many scallops the player collects or has in their inventory, however, like New Leaf, he will not appear if the airport gates are open.

How many times a day can Pascal come?

In New Horizons, Pascal will appear once per day after your player finds a scallop underwater. However, if you refuse to give him your scallops, he will continue reappearing until your player relents.

Does Pascal come everyday?

Pascal will only appear once a day! Even if you get multiple scallops on a day, you can only get him to appear once. If you change the date, you'll have to get a new Scallop that day to summon him.