Gamepress said that each move combination while not equally as strong are still better than whatever the next best defending Pokémon has. Basically what I'm getting from that is "a Blissey is a Blissey. It's strong regardless)". How much do IVs matter in this context? I have a 15-11-11 (84%) Chansey that is 12 candies off of a Blissey and I'm curious as to whether or not I should rush into a Blissey or instead wait for the best possible Chansey. Does it even matter? Is Blissey just THAT good that a few IV points don't make a huge difference? Thanks all!
ATT-IV has great influence on CP and Position in Gym. Use CP-calc
https://pokemongo.gamepress.gg/cpcalc#/
for further information.
Moveset is invisible for the attacker at first, so it will not decide whether the gym will fall, it will decide how many revives / potions the attacker will need after the gym will have been fallen.
CP is calculated out of all STATs. Each Stat is a sum of a static part (shown on pkm-description-site) and an individual value (iv) ranging from 0...15.
CP is calculated as ATT * (DEF * STA)^(1/2), so ATT-Stat is most important anyway.
At blissey, ATT is the smallest STAT, and a high IV has the greatest relative influence.
15 Points ATT give a
((129+15)/129)-1 = 12% bonus on CP
15 Points DEF give a
((229+15)/229)^(1/2)-1 = 3% Bonus on CP
15 Points STA give a
((510+15)/510)^(1/2)-1 = 1,5% Bonus on CP
You see, for blissey, ATT-IV matters most, by far.
Just to supplement this with a real-world example, I have two Blisseys: the first is 87% IV but has a 15 attack IV; the second is 96% but has only a 14 attack IV.
The first is maxed out at 3140cp and the second is maxed out at 3144. Despite having four extra IV points, and only one less Attack IV, the max CP is almost identical.
This is how important the attack IV is for Blissey and her maximum cp.
Your initial formula is a little off.
CP = Atk * Def^.5 * Stm^.5
Multiplying the square root of Def and the square root of Stm gives a psuedo-average of the combined defensive stats.
When finding the percentage difference, I think you probably also want to take two square roots first, then divide.
( (base Def + Def IV)^.5 )/(base Def ^.5)
A low level/CP Blissey is pretty useless as a defender and would only annoy your teammates to want to prestige your gym (this is assuming you even have gyms which are stagnant). They are also very easy to destroy due to quick moves being fast again so for me and my gym area, I wouldn't bother evolving a Chansey -> Blissey just to get the dex entry.
What I feel is if you plan to put a Blissey in a gym, movesets don't matter "that much", but like all gyms, CP is king so you want as much CP as possible. Also, I've notice at higher levels, CP matters even more since 100CP can mean the difference between near the top of a gym or the bottom since that's 2 full trainer level of powerups.
I would wait in your shoes and walk or get more candies first since low CP Blisseys are pretty useless IMO. I had over 500+ candies from multiple hatches, walking 200km prior to Valentines and still only maxed 2 Blisseys due to candy costs at high levels.
Just an example to clarify:
I have a 98%IV (14/15/15 Attack/Def/Sta) Blissey at level 32,5 her CP is 2854
I also have a 75,6% (15/11/8) Chansey. If I evolved her and took her to level 32,5 she would become a Blissey with CP 2831
For comparison:
100% Blissey would have a CP of 2874 at that level
0% Blissey would have a CP of 2458 at that level
So there really is not as much difference between my two Pokemon as you would think, both of them come very close to perfect. If your 15 is the Attack stat then you have a really good Chansey there. Its CP efficiency (that is the percentage CP it could get compared to a 100%IV one) would be around 90% I would guess. So you could wait for a better one but the chances are slim.
I would say go for it and enjoy her whatever moves she gets.
There is an app for ios called Pokegenie. You can take a screenshot of your mon and check all this for yourself in a very easy manner and you will get its CP at any level compared to a perfect one.
Hope things are a bit clearer now so you can make a decision.
So even though I agree with ironman_gaming above that in general it is not worth it to invest in low IV mons as defenders the point I am making is that your Blissey is in fact 90% IV efficient or more.
