things that I look at are telling me that it's in either isle of armor or crown tundra
which is it in??
Magby will be in the Crowned Tundra.
Hope this helped!
Source (Ctrl F + Magby)
Magby and their evolution line will be available in the Crown Tundra. It is unobtainable in the Isle if Armor. The same applies for its counterpart, Elekid.
Source (you can Ctrl + F Magby if that helps)
Magby, Magmar, Magmortar, Elekid, Electabuzz, Electrivire will be avalible in the crown tundra, i"m guessing they're going to be verson exclusives