Chansey ??? Tier

Chansey will always placed at the bottom of a gym.

If i am in same team and want to get in, i can't prestige this gym. The only chance is, to take a friend or a second acount of different team, kick chansey out, and prestige gym afterwards.
Is this good for the team? No, as long as chansey is in, gym will not raise.
Is this good for Chanseys trainer? No, he will be kicked first - either from own or opposing team.

One single story of a gym with chansey that rested for three weeks does not prove anything. From work i see a gym with a CP1200 Pidgeot, that lasts for three month. That does not prove Pidgeot to be a high tiered gym defender.

Does a chansey deter opponents? I suggest, it does not. It may have 50% more effective health in comparison to snorlax. On the other hands side, it does not force attacker to dodge, as it has a really low attack stat.

I do not rate Chansey a 1,5 Tier, i agree to the ? rating in gamepress.

Well, my personal thoughts is that unless you have a gym with multiple Chanseys in a row (like 3-4-5 or even more) it is an underrated mon for defense, nowadays everyone is at least level 30 (at least almost everyone involved in gym battling), so it is very easy to take down a Chansey, it just takes more time than other mons but her attack is sooo low that even having a huge HP pool it won't last, and also Chansey will have always the bottom spot of a gym, so you just need to fight her once to kick her out.

For me Snorlax is like 100 times better, and other low cp defenders like Poliwrath and Slowbro are much more annoying. It is true that most people don't have patience but 90 seconds is more than enough to take down a Chansey.

Things will be a lot different when Blissey comes out, she is gonna be a gamebraker for sure if nothing is done in terms of balancing and I defenitely see her taking Snorlax and Dragonite from the top places of gyms.

I would rank Chansey in Tier 2. Its taking an absurdely high amount of time to take her down, so if you use Bubblestrat to combine 10 Chansey in a gym, its almost guaranteed, that no sole player is looking forward to take down such a gym, so it has a lot of potential. On the other hand she doesnt really shine in any specific matchups with the neutral typing, which can be an advantage as you can see at Snorlax, but on the other hand, the damage-output is simply too low, to threat anyone without being super effective. So to me Poliwrath/Slowbro are slightly better defenders. Also it has some clear disadvantages for your team, as some has already mentioned. Thats why I would say, that one single Chansey doesnt make a great defender, but a gym full of them will annoy the hell outta the attacker. ;)

Chansey was good during the short period of time while prestige was halved and ditto was introduced. Many players were placing low CP trash and newly acquired dittos in gyms that weren't being prestiged. For that brief time chansey could sit above the bottom spot and was fairly useful forcing the opponent to fight it multiple times.

Nowadays...not very useful without teamwork.

I simply throw Chansey into the gym that is taken down 10 times everyday in our campus after I take that gym down every morning/evening when I pass by. Just to annoy the other teams;) That gym is rarely leveled up above level 4... so...

Gym here have 1200 vaporeon, 1300 flareon and 1400 charizard.

So im using my 1236cp chansey as 9th defender, so it leaves 1200 vaporeon as 10th defender and then protects those low cp fire types.

Also this gives me time when i see gym is getting attacked, to go out there and start prestiging it again while under attack.

Without Chansey, they could easily go and tear gym down before i even get chance to go out there and start prestiging again.

Level 10 gyms with 2 (or more?) Chancey at positions 8/9 or 9/10 seems to be a good deterrent against 2nd account sniping - from my experience in a gym where I kept getting kicked out since near the bottom, until some kind souls put in these two pink mons. Certainly will be different post-event.

You want the actual defender tier list? Go to the pokemon list page, order by max CP and remove the ones that are not out yet.

Chansey is definitely a greater deterrent to prestigers than attackers. (I wish Niantic would change the prestige drop formula to fix this; but for now it is what it is.) A gym with a Chansey can be prestiged if there are 3+ similar CP Mon above Chansey with more than twice Chansey's CP; but you don't know if someone moron is going to put their 1800 Snolax right above your 1000 CP Chansey before level 10. Alternatively, who wants to volunteer to be first out after prestiging to level 9 or 10?