The good article on Gym diversity and defensive cores
https://www.reddit.com/r/TheSilphRoad/comments/5zsilp/defensive_type_synergy_another_spin_on_optimal/
As opposed to the subpar one from another site shared several posts below.
This one is written by RyanoftheDay who was mentioned by dondon when he explained Gamepress's defender tiers.
It is an elaboration of the basic idea that Gya-Rhydon-Gya - Rhydon is a lot more stronger than Gya-Gya-Rhy-Rhy.
And finds some nice usage for Slowdudes, Golem, Donphan and others in 3 different cores.
Answers
Ofcourse, but I have: 1 big blissey, another 2k one that is at most 3rd in line for walking and 3 Snorlax, all with EQ and 2 with lick.
So I need to use Gya, vape and soon a 3k Rhy and a 3.3k Dragonite for defense.
And right now my 3k Gya is on top of 4 other gya and below 2 dragonites. Indeed a walk in the park for 3 jolts and a cloyster. :)
And my 2.1k slowbros and slowking getter dust and no statdust. And my donphan did not yet saw a gym or got stardust, but combined with some vapes he can earn his value on some low traffic gym.
So that will have it for second vape. My lvl 30 Solar venu can beat two 2.8 vape most of the time, but that,t it, and only if they are in line and I have SoB ready or almost ready for 2nd fight.
I did this and used rhydon for some snorlax later in the gym. Normaly I would have used a vape in that snorlax and on his neibor rhydon. So indded cost my on overall efficiency for that run.
Yes, that's what I was sayng. If 2 vapes are split by something elsr than Rhydon I cannot take 2 defenders with my SoB venu :).
Your ideea with Flareon is viable, with fire spin he is stronger on defense than before, probably clise to a vilt swith jolteon. Keep in mind volt switch is strongest def move now, that is why jolt and ampharos get mentioned now in relation to defense :).