There's already some tiering for LC, from Pokemon Online.
LC "uber" -
Carvanha, Gligar, Scyther, Sneasel, Tangela, Vulpix, Yanma
Items: Berry Juice, DeepSeaTooth
LC "OU" -
Abra, Aipom, Axew, Bronzor, Chinchou, Cranidos, Croagunk, Darumaka, Diglett, Dratini, Drifloon, Drilbur, Dwebble, Elekid, Ferroseed, Frillish, Gastly, Hippopotas, Houndour, Joltik, Larvesta, Lickitung,Lileep, Machop, Magnemite, Mankey, Meditite, Mienfoo, Misdreavus, Munchlax, Murkrow, Natu, Pawniard, Porygon, Ponyta, Scraggy, Shellder, Slowpoke, Snover, Staryu, Stunky, Taillow, Timburr
LC "BL" -
Poliwag
all others are UU or below.