chilango
Hypothetical Wanker
Even the same type can have different special abilities. Also weak ones are easier to upgrade which gives you more xp making you better at upgrading better ones, i think.
I think it only pays to transfer when you need more space.
Oh :
I'm transferring any triplicates or above so that I aim have one of each for evolving and one of each to upgrade. Then I use the prof's candy on one of these.
Am I doing it wrong?