>>37210431I'm not OP, but no. Half the shit in southern Kanto is too late to use. RBY gives you the Fossils at 30 which isn't terrible, but they're literally unusable in FRLG because you get them at 5.
Seafoam Island encounters are not good either, because whether you go there immediately after Koga or not, your team should be low 40s (mid to late 40s if you've done Saffron already) so the Seafoam encounters are worthless. Pokemon Mansion encounters are also trash. The only "new" Pokemon there might be Magmar depending on your version. Even Power Plant encounters are bad, because you can't go there til after Koga.
Besides. Who reaches Cinnabar from Fuschia? Everyone I know just flies to Pallet then goes south.