They said the Collection Challenge will reward you a Sinistea, but the Collection Challenge just asks you to catch a Sinistea and rewards you with berries. It's like the time they said the Sinnoh Tour research would reward you a Dialga or Palkia but it ended up asking you to catch one from raids instead. At least there's Timed Research that gives a Sinistea, but you need to Win 5 Raids to get it.
