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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.
I don't generally recommend video guides, but there is a text guide on its wiki.
pkmn-chest isn't an emulator, it's a save editor. It should be as simple as copy pkmn-chest.nds to your DS's SD card and load it from TWiLight Menu++.
I assumed you're on DSi because you said "DS XL" and that isn't a thing so I figured DSi XL, if you're on a 3DS XL though you'll actually want to use PKSM, it's basically the same thing but a bit better as it runs in 3DS mode.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.