Gen 1: RBGY - 30fps
Gen 2: GSC - 30fps
Gen 3: RSE/FRLG - 60fps
Gen 4: DPPt/HGSS - 30fps
Gen 5: BW/B2W2 - 30fps (60fps in battles)
Gen 6: XY/ORAS - 30fps
Gen 7: SM (likely USUM as well) - 30fps
Obviously some of the games have frame-drops, but this is the targeted frame-rate for all the Pokemon games by Generation.
Hope this helps!