Some that I know of
League staff is the inside of a pokemon gym from swsh that I forgot the name of lmao
Feebas from darkness ablaze is in the lake at the end of route 2 in swsh out by professor Magnolia’s house
alolan persian in the ruins of alph
felicity’s drawing where she’s in the jubilife tv station
elite four + battle frontier from rse in power keepers
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whole bunch of gym leader areas from gym challenge and heroes
neo genesis has sprout tower and moo moo farms from gsc and bills teleporter from rby
ruin wall from neo discovery
this drifloon has jubulife city in the bg
and this one has the valley windworks in it
this one is in front of N’s castle
this one is above several unova places including skyarrow bridge
(don’t ask me why there’s so many drifloons okay, I just knew about the one at valley windworks and looked up the other artworks while i was at it and saw them)
this is all I can think of for now. If I can think of more later or want to keep looking I’ll make another post