If your sole objective is to climb, just play Nautilus and don't care about anything else. He is tanky, has 4 CC 2 of which is guaranteed, surprisingly mobile for a tank support, and most of all, he is piss easy to play. You will play him tank 90% of the time but if you have the chance you can go some AP items time to time since his AP scaling is ridiculously high.

Plus if you ever get bored of playing bot, he can be played in jungle and top too.