### Ekans
From above, if it tucks its tale in.

[![Ekans][1]][1]  
<sub>(source: [bulbagarden.net](https://cdn2.bulbagarden.net/upload/thumb/f/fa/023Ekans.png/250px-023Ekans.png))</sub>  


### Parasect
Again, if it tucks in.

[![Parasect][2]][2]

### Ludicolo
From above.

[![Ludicolo][3]][3]

### Seedot
From above.

[![Seedot][4]][4]

### Castform (Normal form)
From above.

[![Castform (normal)][5]][5]

### Shuppet
I think the skirt can be tucked in so it looks circular from above.

[![Shuppet][6]][6]  
<sub>(source: [bulbagarden.net](https://cdn2.bulbagarden.net/upload/thumb/4/4b/353Shuppet.png/250px-353Shuppet.png))</sub>  


### Snorunt
Again, I think the hands can be tucked in and it will be circular from above.

[![Snorunt][7]][7]  
<sub>(source: [bulbagarden.net](https://cdn2.bulbagarden.net/upload/thumb/6/6b/361Snorunt.png/250px-361Snorunt.png))</sub>  


### Drifblim
From above. It's the evolved form of Drifloon which was mentioned in another answer, but, well, they are different Pokémon and Drifblim wasn't explicitly mentioned yet, so...

[![Drifblim][8]][8]

### Happiny
From above, of course.

[![Happiny][9]][9]  
<sub>(source: [bulbagarden.net](https://cdn2.bulbagarden.net/upload/thumb/2/27/440Happiny.png/250px-440Happiny.png))</sub>  


### Solosis
It's... literally a sphere...

[![Solosis][10]][10]

### Vanillite
The clouds in the picture are NOT a part of the Pokémon, so - from above.

[![Vanillite][11]][11]  
<sub>(source: [bulbagarden.net](https://cdn2.bulbagarden.net/upload/thumb/3/3f/582Vanillite.png/250px-582Vanillite.png))</sub>  


### Amoonguss
Another evolved form that wasn't mentioned before. Just needs to tuck its hands in before viewing from above.

[![Amoonguss][12]][12]  
<sub>(source: [bulbagarden.net](https://cdn2.bulbagarden.net/upload/thumb/1/13/591Amoonguss.png/250px-591Amoonguss.png))</sub>  


### Beheeyem
While I'm not quite certain about it's previous evolution (Elgyem), Beehyem can DEFINITELY look round when viewed from above.

[![Beheeyem][13]][13]  
<sub>(source: [bulbagarden.net](https://cdn2.bulbagarden.net/upload/thumb/2/2c/606Beheeyem.png/250px-606Beheeyem.png))</sub>  


### Litwick
Is a silhouette a shadow and does a flame affect it then? I think not, so - round from above!

[![Litwick][14]][14]  
<sub>(source: [bulbagarden.net](https://cdn2.bulbagarden.net/upload/thumb/8/8e/607Litwick.png/250px-607Litwick.png))</sub>  


And there were a bunch of others that I wasn't really sure about. To be honest, I wouldn't have included Jigglypuff myself because I think its hands or ears would distort the circle from any angle. It was for this exact reason I omitted a whole bunch of others like Igglybuff, Kabuto, Togepi, Sunkern, Swinub and others.

 [1]: https://i.sstatic.net/dZc4L.png
 [2]: https://i.sstatic.net/ZWwKy.png
 [3]: https://i.sstatic.net/BRnaZ.png
 [4]: https://i.sstatic.net/6YbgH.png
 [5]: https://i.sstatic.net/U9mOT.png
 [6]: https://i.sstatic.net/HLcBP.png
 [7]: https://i.sstatic.net/cWIPw.png
 [8]: https://i.sstatic.net/D54sh.png
 [9]: https://i.sstatic.net/9wMXn.png
 [10]: https://i.sstatic.net/rXtlf.png
 [11]: https://i.sstatic.net/B7aNO.png
 [12]: https://i.sstatic.net/awWzi.png
 [13]: https://i.sstatic.net/6qI0f.png
 [14]: https://i.sstatic.net/BEo2j.png