As announced on Pokemon GO's official Twitter yesterday the Aurora Pokemon, Suicune, is the main focus for this next group of Field Research tasks. It's not a guarantee that you'll walk away with one in pocket, but completing your tasks at least gets you face-to-face with it.
October Field Research tasks featuring the Aurora Pokémon, Suicune, are now live! pic.twitter.com/Nqib7OZ9IE— Pokémon GO (@PokemonGoApp) October 1, 2018
Putting that bit of news aside for a sec, you'll soon get the chance to encounter Krabby by completing water-themed Field Research tasks. Who knows? It might even be shiny.
Finally, there are a handful of Boxes currently on sale according to Serebii, including Great Box, Special Box, and Ultra Box. There's no word on how long these will be going cheaper for, so you'll have to check your local store.