Gen 1
Lowest BST: Caterpie/Weedle (195)
Fully evolved lowest BST: Ditto (288)
Gen 2
Lowest BST: Sunkern (180)
Fully evolved lowest BST: Smeargle (250)
Gen 3
Lowest BST: Azurill (190)
Fully evolved lowest BST: Shedinja (236)
Gen 4
Lowest BST: Kriketot (194)
Fully evolved lowest BST: Kriketune (384)
Gen 5
Lowest BST: Patrat (255)
Fully evolved lowest BST: Wachog (420)
Gen 6
Lowest BST: Scatterbug (200)
Fully evolved lowest BST: Vivillon (411)
Gen 7
Lowest BST: Wishiwashi (175)
Fully evolved lowest BST: Wishiwashi (175)
Gen 8
Lowest BST: Blipbug (180)
Fully evolved lowest BST: Pincurchin (435)