If you're playing Animal Crossing: New Horizons and want Merengue to join you, then there are several ways to do this. Firstly, you might just get lucky and have her be one of your starting villagers. However, with 397 total villagers available, the chances of getting her straight away are pretty low. Instead, she might show up at your Campsite, or on a Nook Miles Mystery Island if you have an empty slot available. If you do have an empty slot, but don't want to fly to Mystery Islands, you can try joining a Facebook group for trading villagers, and see if anyone has Merengue in boxes (that's how I got mine). They may ask for some in-game items as payment, but you should never pay real money as that goes against Nintendo's terms of service. Alternatively, you can use her Amiibo card to invite her to your island.