Pokemon Go: Evolve Pidgeys and Rats regardless of their IV?
I've managed to make it to level 28 and (foolishly) I'm just know understanding the IV portion of the game in regards to what I evolve or trade in for candy. Thank you in advance for your advice on my questions.
1) Should I continue to mass evolve Pidgeys and Rats to level up regardless of their IV? Or should I be choosey?
2) I have several high cp Pokemon (2400+). However I recently discovered their IV'a are quite low. Should I concentrate on leveling up those Pokemon that have high IV's since I combat in gyms frequently. Example: I have an aerodactyl with 100% IV and cp of 1100. I also have an Eggsecutor at 2400 with an IV of 50%. Which shall I save up my stardust for?
Thank you again for your help!! Really appreciate it!