There are 4 in-game trades in ZA:
1.
Pikachu -> Heracross
Traded by a lady (Tracie) at a shopping centre near Rogue Street
2.
Abra -> Riolu
Traded by a kid (Bond) at Academie Etoilie
3.
Slowpoke -> Galarian Slowpoke
Traded by a guy (Quille) in South Boulevard
4.
Raichu -> Alolan Raichu
Traded by a trainer called Griddella outside of Quasartico Inc. You will have to battle her before the trade
Source:
Serebii
