Poké mon, what crystal did the beach bring?

Poké mon, the beach should bring fire wind crystals. Go to the seaside for training at 25-30, and bring fire wind crystal. Crystal consists of four elements: earth, water, fire and wind. Only two adjacent properties can be stored on the same crystal. So the types of crystals are: earth crystal, crystal, fire crystal, wind crystal (four single-element crystals), earth crystal, crystal, fire crystal and wind crystal (binary crystal).