Niantic has made changes to Pokmon Go to accommodate the COVID-19 pandemic, including numerous ways to prevent people from meeting in one place, and the latest paid challenge reflects this. I am starting my search and I have no problem achieving my goals from home.
If players purchase the $ 7.99 ticket for the "A Drive to Investigate" Special Investigation Task, they will have between now and March 23 at 10 p.m. local time to finish it. Unlike previous tasks, this one is simplified to feats you can manage from home, including capturing item-based Pokmon, playing with your friend, and fighting other trainers (which you can do through the battle league) . To catch the elemental Pokmon, I recommend using incense to create more spawns. A large amount of incense can be purchased from the store right now for just one gold, and each lasts an hour (instead of the usual 30 minutes).
You only need to complete four of the five tasks to get to the Genesect encounter, although the fifth task gives you 10 additional Genesect sweets. Good luck with the mission, trainers and have fun!