Unimon and Rapidash can definitely be considered as rivals from the Digimon vs Pokemon side since they both share several traits. I would definitely give the edge to Rapidash as he has a much larger array of attacks and techniques at his disposal, but Unimon can use his extra forms to his advantage. It won’t be enough, but Unimon can definitely turn this into a close fight. Rapidash wins.

Disclaimer: This image was created by ArtistMaz and you can find the original image at the link below

http://artistmaz.deviantart.com/art/Unimon-VS-Rapidash-30212372