>Bulbasaur line
Not ideal for love. Poison grass dino =/= sexy. C-tier and d-tier.
>Squirtle line
Decent for love, but Blastoise is too bulky. At best b-tier, at worst low c-tier.
>Charizard line
Ignoring flames, 'zard may be viable for looks. First 2 c-tier, 'zard b-tier.
>Totodile line
Decent for love, but teeth may be unideal. Last two low b-tier, dile c-tier.
>Cyndaquil line
Ignoring flames, Quilava and 'phlo are A-tier. Quil is b-tier.
>Chikorita line
Mega too sticky, but the rest are okay. Last 2 evos b-tier, rita low b-tier.
>Torchic line
Ignoring flames, last 2 evos are high B-tier. Tor high c-tier.
>Treeko line
Grovyle high B-tier, Sceptile & Tree low b-tier.
>Mudkip line
Mud = bad smell. Last 2 evos c-tier, kip d-tier.
>Chimchar line
Ignoring flames, last 2 evos are mid B-tier. Chim is F-tier for pedo.
>Piplup line
Prinpilup b-tier, Piplup c-tier, Empoleon d-tier.
>Turtwig line
Turtwig c-tier, Torterra and stage 2 d-tier.
>Fennekin line
Ignoring flames, last 2 evos a-tier, fen b-tier
>Froakie line
Last 2 evos b-tier, Froakie c-tier
>Chespin line
Quilladin d-tier for thorns & ugly, Chesnaught e-tier for bulk, 'pin c-tier
>Litten line
B-tier, but Icineroar is low b-tier for ugly.
>Rowlet line
Dec is b-tier, Dart c-tier, Rowlet d-tier.
>Popplio line
Popplio c-tier, last two evos b-tier.
>Grookey line
Grookey mid b-tier, last two evos low b-tier.
>Sobble line
Intellion high b-tier, drizzle mid b-tier, sobble high d-tier.
>Scorbunny line
Cinderace high b-tier, Raboot mid b-tier, Scorbunny low b-tier.
My opinions.