Super Max Megas reduce from level 55 to level 52 after Go Tour event hours

This is likely because of a bonus during LA Go Tour: “Boosted CP for all mega-evolved Pokémon”. This seems to grant a +3 level boost for super-max (mega-4) pokemon. From my testing the CP boost depends on the mega-level: mega-3s only had a +1 level boost.

This bonus returns in Global Go Tour, meaning level 55s should be back on the menu this weekend.

Coincidentally Mega Master League returns to rotation on Tuesday. Mega Dragonite should be interesting to see as a L52 mon at the beginning of the cup and L55 during the weekend.