Niantic has announced that they have increased the trade range in Pokémon GO for a test that will take place from Thursday, November 12, 2020, at 2:30 p.m. until Monday, November 16, 2020, at 10:00 a.m. PST (GMT −8).

Limited-time test: Trade range increased until Monday, November 16, 2020, at 10:00 a.m. PST (GMT −8)

Trainers, As a limited-time test, from Thursday, November 12, 2020, at 2:30 p.m. until Monday, November 16, 2020, at 10:00 a.m. PST (GMT −8), trade range will be increased! Depending on information gathered from this test, we may include increased trade range as a part of future events.

It’s time to trade, Trainers!

Source: https://pokemongolive.com/post/test-increasedtrading/?hl=en