The Season of Heritage has been off to an incredibly busy start and Pokemon GO players barely have any time to catch their breath as they race through the December calendar of events. In addition to all of the other special bonuses and activities coming and going, there are also some very powerful and popular Legendary Battle Raid bosses available during the first half of the month.
Between December 1 and Thursday, December 16, Pokemon GO trainers are able to find Zekrom and Reshiram in tier 5
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