Blissey is infinitely more time consuming to defeat than Chansey. I even save every wild Blissey regardless of IV as long as it's level 20 or higher. Chansey, despite her high HP, is much easier to beat then Blissey because even though their HP are similar (510 for Blissey/500 for Chansey), Chansey's defense is only 176 to Blissey's 229, so definitely evolve to Blissey. Chansey also does almost zero damage while Blissey's Zen Headbutt and Dazzling Gleam leave Machamp in bad shape by the time he beats her.
Power up hatched Chansey or evolve to Blissey?
Yet another Chansey/Blissey question, I know. But I haven’t really found this answer and I have very limited experience using either of these two.
I have a hatched Chansey that is level 20 with IVs 13/13/11 and CP 806. I’m wondering if it’s better to power up this Chansey to a high level, or to evolve it and be stuck with a level 20 Blissey. Trainer level is 34, but I don’t have the candies to evolve and then power up Blissey. Any thoughts are appreciated!
Answers
Well, before doing anything I would wait until the end of the V-day event; with any luck, you'll catch at least a few wild Chanseys and get some more candy.
Even without the event, I personally would wait until I had enough candies to evolve a Blissey AND get her to somewhere around lv.30. If you're not that patient, I'll say that a level 30 Chansey is a lot less intimidating than even a level 20 Blissey.
Wait one day, it isn't clearly stated, but it looks like chansey spawn could be increased.
Chansey is better for long term defence, blissey is better for highly competitive areas and for holding gyms before raids. IMO chansey is decent even at lvl20 until you and your teammates going to build toughest gym to hold before ex-raid.
A level 20 Blissey is a better defender at full motivation than a level 30 Chansey. That said, the Chansey will keep its motivation much longer and can be slotted into gyms that already have a Blissey. So it comes down to what is valuable for your area.
To be honest, if you don't feel a desperate need for a gym defender, don't do anything with it yet. Wait until you have 100+ candy so you can evolve and power up, might get a better Chansey for it in the meantime.
Both have uses. Like others have said, it depends on what you will primarily use them for. I have 2 1000ish cp Chansey that get dropped in gyms daily. Also have 3 Blissey that get dropped daily as well. The Blisseys go in high turnover gyms in the first slot. The Chanseys go in low turnover gyms or gyms with a Blissey already defending.
I have one of my Chanseys that is slotted first in a hard to get to gym. It gets one G-Razz a day and holds the line (and motivation!). The gym is near a red light at a busy highway. The light typically doesn't stay red long enough to beat the Chansey more than once for a driver-by. The only other way to get to the gym is to park in a private lot and walk about 50 yards. No one has been brave enough to do that. Or you could spoof, of course. She's been in there for 5.5 days now. Was in the gym for about 2 days prior to that. Gonna likely be an easy gold badge for me.