Here are a few Pokemon.
No Legs:
#684 Swirlix (Fairy)
Four-Legged:
#262 Mightyena (Dark)
#309 Electrike (Electric)
#310 Manectric (Electric)
#310 Mega Manectric (Electric)
#506 Lillipup (Normal)
#507 Herdier (Normal)
#508 Stoutland (Normal)
#676 Furfrou (Normal)
#744 Rockruff (Rock)
#745 Lycanroc Midday/Dusk Form (Rock)
#772 Type: Null (Normal)
#773 Silvally (Normal)
Two-Legged:
#448 Lucario (Fighting/Steel)
#745 Lycanroc Midnight Form (Rock)
#685 Slurpuff (Fairy)