this is kind of complicated, so i'll detail it first
wild pawniard appear in one map (map 412, titled route 4) at day and night with a 5% chance, however, time is divided by day (10 am - 4:59 pm), night (5 pm - 5:59 am), and morning (6 am - 9:59 am). this means that encounters between 6 and 9:59 am will never have pawniard. you can offset this with the unrealtime password, changing your pc's time, or just playing at 2 am lmao
once you have the time set, the chance is actually irrelevant. you can have your lead hold a magnetic lure to guarantee wild encounters not registered in the pokédex (distinct from unseen; it applies to pokémon you haven't owned yourself)
additionally, map 412 isn't the only map titled "route 4", as it's divided across a whole bunch of maps, you'd think this would result in it being some weirdly specific part of the route like one of the mountains, but it's actually the very first part of it, which connects with route 3
though if you're not in the mood to do that and are available, i can trade it lol