>>34710692I was thinking about it earlier this week. All Pokemon should have at least 3 sizes (Small, Normal and Big and some could have like a Super Size Ex: Gyarados, Steelix) and within their size they should have a weight range.
This could be introduced with a Pseudo, specifically, a silver back gorilla. Only the tallest and bulkiest evolve into the last stage and those are hard to get but you can breed it afterwards.
Also, only big Steene evolve into Tsarena and so on.
