Akin to how six different Unown appeared at the first-ever Pokémon GO Fest to spell out the word Chicago, a similar occurrence is currently taking place in London to spell out the word Europe. You can spot the relevant letters in the Pokémon GO screenshot above. This is part of the ongoing celebration of the one-year anniversary of Pokémon GO.
Source: Andrew Goldfarb
Pokémon Blog 
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