The official Pokémon Masters website has announced that special daily item exchanges are now available for a limited time from October 10th, 2019 until October 16th, 2019.

Special Daily Item Exchanges

Special daily item exchanges are now available for a limited time! Daily item exchanges with better exchange rates than usual will be available for a total of 6 days. Items offered change every day. Take advantage of these special daily exchanges!

Exchangeable Items

• 10/10/2019 at 11:00 p.m. - 10/11/2019 at 10:59 p.m.
  3★ Level-Up Manual × 10
• 10/11/2019 at 11:00 p.m. - 10/12/2019 at 10:59 p.m.
  Buff Blend × 50
  Great Buff Blend × 30
  Ultra Buff Blend × 15
• 10/12/2019 at 11:00 p.m. - 10/13/2019 at 10:59 p.m.
  Tech Tonic × 50
  Great Tech Tonic × 30
  Ultra Tech Tonic × 15
• 10/13/2019 at 11:00 p.m. - 10/14/2019 at 10:59 p.m.
  Aid Ade × 50
  Great Aid Ade × 30
  Ultra Aid Ade × 15
• 10/14/2019 at 11:00 p.m. - 10/15/2019 at 10:59 p.m.
  Replay Ticket × 1
• 10/15/2019 at 11:00 p.m. - 10/16/2019 at 10:59 p.m.
  Replay Ticket × 1

Important

• All exchangeable items can be exchanged using "Coins × 100".
• Daily item exchanges can be found by tapping the "Daily" button on the Item Exchange screen.
• There is a limit to the number of times you can exchange each item.
• Special daily item exchanges are updated at 11:00 p.m.
• The rally period and its content are subject to change without notice.

Source: https://pokemonmasters-game.com/en-US/announcements/Campaign_M2_W2_2