Pokemon Go Battle Day Timeless Travels Timed Research: Tasks, rewards, more

Timeless Travels has brought another Battle Day, and trainers want to know all about this Pokemon Go PvP event, so here's all the info.

This is a companion discussion topic for the original entry at https://www.charlieintel.com/pokemon/pokemon-go-battle-day-timeless-travels-timed-research-tasks-rewards-more-303750/