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I tried to make one based off early route mons (first 2 routes/early game forest, basically)
This ended up being a little too easy though, aside from trying to choose from all the bug shitmons. You could replace M-Beedrill with Leavanny too but he's really only early game in BW2.
Theres also Pikachu, Marill, Pelipper, the gen 3 exclusives (lotad/seedot), and Ralts that fall into a weird grey area for me.