rikkailla

Could you clarify what you mean by "rikkailla"? It could refer to different things, such as a Finnish word, a place name, a brand, or a fictional concept. If you mean the Finnish term related to wealth, the standard forms are rikastaa (to enrich/to make rich) and rikastua (to become rich), and there isn’t a widely recognized standalone dictionary entry for rikkailla in contemporary Finnish. If you specify the intended sense (linguistic term, geography, culture, etc.), I can write a concise, neutral wiki-style article under 300 words.