I can trade a Meowth for Mareep, Drowzee for Phanphy, Slowpoke for Cacnea, Krabby for Spinarak, Kabuto for Cubone, Chinchou for Koffing, Poliwag for Shuppet, Ekans for Shieldon and Weedle for Gible.
I know that's a lot and I am willing to just trade a few if you don't want to trade them all.
I can get them in their egg's or newly hatched for you, whichever you prefer.