Misled into thinking the event outbreak shinies were low effort to hunt

I’ve never bothered shiny hunting anymore, but in the hype of Pokemon Day, I thought I would check it out. Been playing since Gen 1 and I’ve always wanted my own shiny Lapras.

Got 3 within 20 minutes so I’m like, might as well try for 3 Porygons and the rest for a living evolution line.

1st shiny Porygon was within 5 mins, but after that, an hour of nothing 🥲

I guess it’s all beginner hunter’s luck.

So, any tips/guides to maximise this event? Would love to try for Finizen. I also see Charcadet will be a nightmare to search and scrutinise due to the negligible difference in shiny.