I wanted to know because I know they're some that have to be I obviously pikachu
Pikachu,Ditto,Geodude,There is always a "New Pikachu"(EX:Emolga),Zoobat,Golbat,Weedle(Pretty Sure) Caterpie(Pretty Sure), and Nidoran.Magikarp,Dratini(well atleast in most games).
There is now no Pokemon that can be caught on every game now.
Well, Magikarp can be caught in Gen I-IV and bought in Gen V.
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