Funnily enough the answer is actually Wobbuffet. It has base 190 HP, 58 Defence, and 58 Special Defence.
The second highest that fits your criteria (and highest one with a proper move pool) is Hariyama, with base 144 HP, 60 Defence, and 60 Special Defence.
As you can see, the Pokemon with the highest HP stats generally have pretty low defences to make up for it.
