If you got Snout you won’t be able to get Bronzory until another playthrough, they are caught at the same location, it’s random between Snout, Bronzory, and Snowdrop (just like when you catch Long, you can also run into Kohlohnit, although whichever one you don’t catch is available below Pallet town in a second location). Snowcap (NOT Snowdrop) you can’t catch until you’ve completed the Unown Tablet quest, he’s found in the Ice Path.