>>55196555 (checked)Like anon above said, you can only catch what Hanke allows you to. The pool of what's currently available is made of:
Seasonal spawns
Regional spawns
Event spawns (if an event is happening, they will appear alongside others)
Nest spawns (parks are considered nests of some select species that will appear there in increased numbers)
Incense spawns
Lure spawns
Surprise encounter (Smeargle, after taking a pic)
Other than that there are eggs with their own pools, raids and research tasks. GBL has some too.
For example:
>Like how do I get a bunch of bulbasaurs to level?They made starters regional for the season, so if you're not seeing any Bulbasaur but can find Totodile, that is why. But there's good news too, if you see the task to power up 3 times, it has a 1/3 chance of granting you a Bulba.
Visit LeekDuck for more information on tasks, raids and eggs.