It just feels so implied that entries Zangoose and Seviper will be about their rivalry, when the entry should really be about the Pokemon itself. I think that with the rivalry orb looking like it does and with any back knowledge they have (most people will have played something after Gen III) it isn't necessary to include IMO.

ZANGOOSE uses its extremely long and sharp claws both offensively and defensively. This Pokemon's long-standing rivalry with SEVIPER is thought to be over territory.
If there is still disagreement, this splice of Cyn and OddCrow is the best that has been made to that end so far.