Forum Thread
Auction Prices
Forum-Index → Discussion → Auction PricesOr, you could just put up a trade on the GTS saying free. Pretty sure lots of newbies will offer.
It's not accurate with everything on the site so looking around for how much others are asking for something is indeed a good strategy. But the price check is usually a good place to start getting some kind of idea of how much things are worth.
Good old normal pokemon don't usually sell for much (unless they're brand new), which is why people oftentimes just release them to free up space rather than put up auctions and wait for them to finish to get a lil' bit of pocket change.
I tend to just toss hunt extras into auctions starting at 1 PD and don't really even look at what I get. I mostly do it in case people need them for the dex or whatever else so they don't go to waste by just releasing them, there's not much profit to be had there. (Scrolling through my sales now, most of them went for under 100 PD. Newer galar pokemon have broken 1000 PD few times.)
For riolu, 100 PD seems like a decent enough starting bid since that's still not a lot of money either. If you don't get bids, then you might wanna consider lowering it.