Seedot has never made an appearance in the 10 km egg group, so as the current patterns show, it may not qualify.
With the current and past egg charts in mind, there are these following strong possibilities:
- Ralts (likely with another PvP Sinnoh Stone promo)
- Trapinch (while in a 5 km egg currently, Mareep and Eevee were both in 10 km eggs at one point, and Eevee was demoted to 5 km eggs before its CD)
- Porygon (Can’t dismiss this one yet, despite it’s relative uselessness)
- Gible (Obviously this is going to have a CD at some point)
Now, it is possible that we could see something else since Swinub was chosen, and that’s a 2 km egg hatch.