I was writing Pokemon fanfiction when I was in primary school (ie when I was 10, way back in the year 2000). It is thankfully lost to time.
Since there's a gap of quite a few years there the oldest fic associated with any username I still have was a Buddyfight one in 2015, which I don't think anyone else conceivably has any more. Way too melodramatic and I've no intention of ever revisiting the plot.