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Many worthwhile moves went from TMs to TRs. TRs are single-use and you buy them with some points you get from doing Max Raid Battles, meaning that we need to grind for key moves again when building a team.
Clearly, this was made as an incentive to participate in Max Raid Battles, but it's 1 step forward and 2 steps back. I wonder if any pirate chad can shed some light on how long it takes to grind Watts