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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Also there's this encounter rate calculator tool which also does not list the level 4 Golbat as a possibility. https://github.com/AngefloSH/PokemonEncCalc I'm assuming it sources its encounter data directly from the games so I consider it a pretty reliable source.
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